diff --git a/client/scripts/autoloads/input_mapper.gd b/client/scripts/autoloads/input_mapper.gd
index 47d92bc86..d4f41a066 100644
--- a/client/scripts/autoloads/input_mapper.gd
+++ b/client/scripts/autoloads/input_mapper.gd
@@ -13,6 +13,27 @@ extends Node
 # Sprint=5/s, Walk=2.5/s, Careful=1.7/s, Crouch=1.25/s.
 # Server cooldown is authoritative, but the client throttle prevents
 # flooding and gives correct movement feel in test mode.
+#
+# T-1146: implant-occlusion gate. Every gameplay-sim-bound action this file can
+# produce (movement, SET_FACING, and every _unhandled_input entry EXCEPT
+# OPEN_MENU/BUG_REPORT/OPEN_JOURNAL, which are client-only and never reach
+# send_input — see main.gd's dispatch loop) is gated on
+# HudGroups.gameplay_occluded, at the POLL SITE (here), not the flush site
+# (main.gd). Poll-site was T-1146's own recommendation and is also the
+# structurally cleaner one: it slots into the existing dialogue_active /
+# free_camera_mode early-return this file already has, and it means nothing is
+# ever enqueued while occluded — a flush-site gate would still enqueue and then
+# have to discard, which is exactly the kind of latent backlog this ticket is
+# about. Movement is HELD-STATE polled (Input.is_action_pressed), so an
+# occlusion-begin transition must be able to interrupt a key already down
+# mid-press, and an occlusion-end transition must NOT silently resume a key
+# still down — see _on_gameplay_occluded and _suppress_move_until_release
+# below. Discrete actions (_unhandled_input) are edge-triggered per-press
+# events, not held state, so there is no backlog-on-close risk for them: a
+# gated press this frame simply never queues, and get_viewport() still has
+# set_input_as_handled() called so the event doesn't fall through to some
+# other handler either (mirrors the existing dialogue_active early-return
+# already established below).
 enum Action {
 	MOVE_NORTH,
 	MOVE_NORTHEAST,
@@ -56,8 +77,6 @@ var input_queue: Array[Dictionary] = []
 # Updated every frame from mouse position. EntityRenderer reads this for indicator.
 var facing_angle: float = -PI / 2.0  # Default: North
 var facing_octant: String = "North"  # Derived from facing_angle
-var _last_sent_octant: String = "North"  # Track to avoid redundant sends
-var _last_move_msec: int = 0
 
 # T-1088 (design §9): 3D facing seam. A 3D scene installs a provider returning
 # sim-space radians (0=East, +PI/2=South — same convention as facing_angle), or
@@ -66,11 +85,66 @@ var _last_move_msec: int = 0
 # the 2D path unchanged. Untyped Callable per the autoload parse-order rule.
 var facing_angle_provider = Callable()
 
+# gdlint class-definitions-order: all public vars above this line, all
+# private (underscore-prefixed) vars below — reordered while touching this
+# file for T-1146 (pre-existing violation on main, unrelated to this ticket:
+# facing_angle_provider used to sit after _last_sent_octant/_last_move_msec).
+var _last_sent_octant: String = "North"  # Track to avoid redundant sends
+var _last_move_msec: int = 0
+
+# T-1146: local mirror of HudGroups.gameplay_occluded, updated by the signal
+# handler below. Deliberately NOT HudGroups.is_implant_active() / is_app_active()
+# — those are true for BOTH FULLSCREEN and INSERT mode (e.g. main.gd opens
+# "implant/economics" in INSERT mode, a small overlay alongside still-visible,
+# still-playable gameplay — D-181/#824), whereas gameplay_occluded (and this
+# mirror) is only ever true for FULLSCREEN, which is the actual "the player is
+# not looking at their character" condition this gate exists for. Read directly
+# in the hot _process() poll instead of calling HudGroups.get_active_mode()
+# every frame — the signal already tells us exactly when it changes.
+var _gameplay_occluded: bool = false
+
+# T-1146: latch set the instant gameplay becomes occluded WHILE a movement key
+# is already held. Cleared only once the poll observes ALL movement keys
+# released (raw_dir == ZERO) at least one frame after occlusion ends — a
+# player who forgot their finger on W when the map closes must re-press, not
+# lurch forward on the very next frame. Facing updates are exempt (see
+# _process) — turning to look is not "movement" and re-syncing facing the
+# instant the implant closes is expected, not a lurch.
+var _suppress_move_until_release: bool = false
+
+
+func _ready() -> void:
+	# Autoload-to-autoload signal wiring is fine at _ready (both are autoloads,
+	# so both are already fully constructed by the time either _ready() body
+	# runs) — the parse-order rule that bites autoloads only applies to
+	# referencing a class_name TYPE, not calling a method / connecting a
+	# signal on another autoload singleton.
+	HudGroups.gameplay_occluded.connect(_on_gameplay_occluded)
+
+
+# T-1146: fires on BOTH the open transition (occluded=true) and the close
+# transition (occluded=false). Open: mirror the flag — the very next
+# _process() poll already gates on _gameplay_occluded below and simply stops
+# producing, so a key held at the moment of opening is dropped this frame with
+# no separate latch needed. Close: mirror the flag AND arm the release-latch so
+# a key still held at the moment of closing cannot resume movement without an
+# intervening release — see _suppress_move_until_release's own doc.
+func _on_gameplay_occluded(occluded: bool) -> void:
+	_gameplay_occluded = occluded
+	if not occluded:
+		_suppress_move_until_release = true
+
 
 # Hold-to-move: poll held direction keys each frame, throttled by stance.
 # D-054: WASD is now mouse-relative. W = toward cursor, A/D = strafe.
 # Server-side cooldown (D-053) is authoritative; this prevents client flooding.
 # D-064: movement suppressed during dialogue (walk-away handled by dialogue_box).
+# T-1146: SET_FACING and movement are both gated on gameplay_occluded — an
+# implant screen open means the player is not looking at their character, so
+# neither "I turned to face something" nor "I walked" should reach the server.
+# Facing-angle tracking itself (facing_angle/facing_octant, purely client-side)
+# still updates every frame regardless — only the SEND to the server is gated,
+# same as the existing test_mode split in sim_bridge.gd's send_input().
 func _process(_delta: float) -> void:
 	# D-054: Update facing angle from mouse position every frame
 	_update_facing_from_mouse()
@@ -78,6 +152,9 @@ func _process(_delta: float) -> void:
 	if GameState.dialogue_active or GameState.free_camera_mode:
 		return
 
+	if _gameplay_occluded:
+		return
+
 	# D-054: Send facing octant to server when it changes (even without movement)
 	if facing_octant != _last_sent_octant:
 		_last_sent_octant = facing_octant
@@ -103,6 +180,15 @@ func _process(_delta: float) -> void:
 	if Input.is_action_pressed("move_west"):
 		raw_dir.x -= 1
 
+	# T-1146: a key still held at the exact moment the implant closed must not
+	# resume movement on its own — the latch (armed in _on_gameplay_occluded)
+	# stays up until this poll observes every movement key released at least
+	# once, at which point a fresh press is required to move again.
+	if _suppress_move_until_release:
+		if raw_dir == Vector2i.ZERO:
+			_suppress_move_until_release = false
+		return
+
 	if raw_dir != Vector2i.ZERO:
 		var now := Time.get_ticks_msec()
 		var interval: int = MOVE_INTERVAL_MS.get(GameState.player_stance, 200)
@@ -123,35 +209,54 @@ func _process(_delta: float) -> void:
 
 
 # Discrete actions: fire once on key press (not held).
+# T-1146: OPEN_MENU/BUG_REPORT/OPEN_JOURNAL are checked and queued BEFORE the
+# implant-occlusion gate — they are the implant/app-level keys the ticket
+# explicitly carves out. OPEN_MENU is how the implant CLOSES (Esc/#528's
+# priority chain in main.gd — HudGroups.close_app() before anything else), so
+# gating it on occlusion would make the implant impossible to close with Esc.
+# BUG_REPORT and OPEN_JOURNAL are client-only (main.gd's dispatch loop
+# `continue`s on both before ever reaching SimBridge.send_input) — neither is
+# gameplay-sim-bound, so neither belongs behind a gameplay-occlusion gate.
+# Every other action in this function (INTERACT, USE_PERCEPTION_MODE,
+# PAUSE/UNPAUSE, TOGGLE_STANCE_*, TELEPORT_HUB, SAVE_GAME, LOAD_GAME) reaches
+# send_input unconditionally once queued (sim_bridge.gd's action_enum_to_wire
+# has a wire case for every one of them) and IS gated below.
 func _unhandled_input(event: InputEvent) -> void:
 	if GameState.dialogue_active or GameState.free_camera_mode:
 		return
-	var action: Action = -1
 
-	if event.is_action_pressed("interact"):
-		action = Action.INTERACT
-	elif event.is_action_pressed("perception_mode"):
-		action = Action.USE_PERCEPTION_MODE
-	elif event.is_action_pressed("open_menu"):
+	# Implant/app-level keys — never gated on occlusion, checked first so they
+	# always win regardless of implant state.
+	var action: Action = -1
+	if event.is_action_pressed("open_menu"):
 		action = Action.OPEN_MENU
-	elif event.is_action_pressed("pause"):
-		var tick_rate = GameState.game_time.get("tick_rate", "Full")
-		action = Action.UNPAUSE if tick_rate == "Paused" else Action.PAUSE
-	elif event.is_action_pressed("stance_up"):
-		action = Action.TOGGLE_STANCE_UP
-	elif event.is_action_pressed("stance_down"):
-		action = Action.TOGGLE_STANCE_DOWN
 	elif event.is_action_pressed("bug_report"):
 		action = Action.BUG_REPORT
 	elif event.is_action_pressed("open_journal"):
 		action = Action.OPEN_JOURNAL
-	elif event.is_action_pressed("teleport_hub"):
-		if GameState.gauntlet_mode:
-			action = Action.TELEPORT_HUB
-	elif event.is_action_pressed("quicksave"):
-		action = Action.SAVE_GAME
-	elif event.is_action_pressed("quickload"):
-		action = Action.LOAD_GAME
+
+	# Gameplay-sim-bound keys — gated: skip the whole block while an implant
+	# screen is occluding gameplay, so none of these can even be recognized,
+	# let alone queued, while the player isn't looking at their character.
+	if action == -1 and not _gameplay_occluded:
+		if event.is_action_pressed("interact"):
+			action = Action.INTERACT
+		elif event.is_action_pressed("perception_mode"):
+			action = Action.USE_PERCEPTION_MODE
+		elif event.is_action_pressed("pause"):
+			var tick_rate = GameState.game_time.get("tick_rate", "Full")
+			action = Action.UNPAUSE if tick_rate == "Paused" else Action.PAUSE
+		elif event.is_action_pressed("stance_up"):
+			action = Action.TOGGLE_STANCE_UP
+		elif event.is_action_pressed("stance_down"):
+			action = Action.TOGGLE_STANCE_DOWN
+		elif event.is_action_pressed("teleport_hub"):
+			if GameState.gauntlet_mode:
+				action = Action.TELEPORT_HUB
+		elif event.is_action_pressed("quicksave"):
+			action = Action.SAVE_GAME
+		elif event.is_action_pressed("quickload"):
+			action = Action.LOAD_GAME
 
 	if action != -1:
 		var entry := {
@@ -185,7 +290,12 @@ func flush_queue() -> Array[Dictionary]:
 # false when throttled or input-suppressed. Ordinary Move* actions only: zero
 # protocol change, no client prediction, the server validates every step (D-010).
 func queue_move_step(tile_delta: Vector2i) -> bool:
-	if GameState.dialogue_active or GameState.free_camera_mode:
+	# T-1146: same suppression predicate as the _process poll — all three
+	# input_queue producers in this module share it, so the occlusion gate is
+	# self-contained here rather than delegated to seam callers (today the
+	# sandbox freezes the path follower itself, but Phase 5/T-962 lifts
+	# click-to-move into the shared session driver).
+	if GameState.dialogue_active or GameState.free_camera_mode or _gameplay_occluded:
 		return false
 	if tile_delta == Vector2i.ZERO:
 		return false
@@ -207,9 +317,9 @@ func queue_move_step(tile_delta: Vector2i) -> bool:
 # Sprint, down = toward Crouch) through the same input_queue movement rides. Discrete,
 # so no throttle — the server's handle_toggle_stance has no cooldown, so the sandbox
 # follower can burst the exact ladder distance and trust it (server validates). No-op
-# while input is suppressed (dialogue / free camera), matching movement.
+# while input is suppressed (dialogue / free camera / occlusion), matching movement.
 func queue_stance_toggle(up: bool) -> void:
-	if GameState.dialogue_active or GameState.free_camera_mode:
+	if GameState.dialogue_active or GameState.free_camera_mode or _gameplay_occluded:
 		return
 	input_queue.append(
 		{
diff --git a/client/tests/test_input_gate_live.gd b/client/tests/test_input_gate_live.gd
new file mode 100644
index 000000000..bb8826140
--- /dev/null
+++ b/client/tests/test_input_gate_live.gd
@@ -0,0 +1,401 @@
+## T-1146: implant-occlusion gate — LIVE tier. Connects the real SimBridge/
+## InputMapper/HudGroups autoloads (not stubs, not TestHarness) to a spawned
+## server binary and proves the actual client-side pipeline end to end: WASD
+## held while a FULLSCREEN implant screen is open must not move the character
+## on the server, and closing the screen must require a re-press before
+## movement resumes.
+##
+## Reuses test_input_roundtrip.gd's/test_sprint2_proof.gd's hard-won live-
+## server conventions verbatim (port-collision retry, wall-clock deadlines,
+## COOLDOWN_TICKS pacing, handshake dance) — see their own header comments for
+## the "why" behind each one. The one structural difference from those files:
+## this test drives input through the REAL client pipeline (InputMapper poll +
+## SimBridge.send_input, exactly mirroring main.gd's dispatch loop) instead of
+## LocalBridge.send_message() directly — the gate under test lives in that
+## pipeline, so a raw-protocol test would not exercise it at all.
+class_name TestInputGateLive
+extends GdUnitTestSuite
+
+const CONNECT_TIMEOUT: float = 3.0
+const RESPONSE_TIMEOUT: float = 10.0
+# Server move cooldown: the proof-room player is Walk stance (ticks_per_move =
+# 2, server stance.rs) — see test_input_roundtrip.gd's own header comment for
+# the full "why" (a dropped move stays dropped no matter how long the wait).
+const COOLDOWN_TICKS: int = 3
+const MAX_PORT_ATTEMPTS: int = 5
+const TEST_APP := "implant/t1146_live_gate_test"
+
+var _server_pid: int = -1
+var _test_port: int = 0
+
+# SimBridge.poll_snapshot() is consume-and-clear on a shared autoload: any node
+# an earlier suite left in the gdUnit scene tree that polls SimBridge each frame
+# (main.tscn instances etc.) steals _last_snapshot during our awaits, so a
+# direct poll here can starve forever in full-suite order while passing in
+# isolation. poll_snapshot() emits snapshot_received on every consume — ours or
+# a thief's — so a signal capture sees every snapshot regardless of who wins
+# the poll race. _await_next_snapshot() checks both paths.
+var _captured_snapshot: Variant = null
+
+# Autoload state to restore in after_test() — SimBridge/InputMapper/HudGroups
+# are persistent singletons shared with every other suite in the run.
+var _saved_test_mode: bool = true
+var _saved_state: int = 0
+var _saved_bridge = null
+var _saved_server_path: String = ""
+var _saved_server_port: int = 9876
+var _saved_current_tick: int = 0
+
+
+func _server_binary_path() -> String:
+	var project_dir := ProjectSettings.globalize_path("res://")
+	return project_dir.path_join("../server/target/debug/settled-reach-server")
+
+
+static func _random_test_port() -> int:
+	return 49152 + (randi() % (65535 - 49152 + 1))
+
+
+## Spawn the server binary directly (not through SimBridge.connect_to_sim's
+## own spawn path) so this test controls port retry exactly like the sibling
+## live-server tests — SimBridge is then pointed at the already-bound port
+## with server_path left empty so it skips its own subprocess spawn and goes
+## straight to the TCP-connect retry loop in its _process().
+func _spawn_server(server_path: String) -> bool:
+	for _attempt in range(MAX_PORT_ATTEMPTS):
+		_test_port = _random_test_port()
+		var addr := "127.0.0.1:%d" % _test_port
+		_server_pid = OS.create_process(server_path, [addr])
+		if _server_pid <= 0:
+			continue
+		await get_tree().create_timer(0.15).timeout
+		if OS.is_process_running(_server_pid):
+			return true
+		_server_pid = -1
+	return false
+
+
+func before_test() -> void:
+	_saved_test_mode = SimBridge.test_mode
+	_saved_state = SimBridge.state
+	_saved_bridge = SimBridge._bridge
+	_saved_server_path = SimBridge.server_path
+	_saved_server_port = SimBridge.server_port
+	# send_input stamps GameState.current_tick into every wire entry, and the
+	# server's InputQueue panics on non-monotonic ticks ("tick ordering
+	# violated"). A stale current_tick from an earlier suite's (or the previous
+	# test's) server — advanced whenever any leaked node applies snapshots —
+	# would stamp this test's first inputs above the fresh server's tick counter
+	# and then drop backward once new snapshots apply. Start each test at 0.
+	# Neutralize SimBridge BEFORE this test's first await (the server-spawn
+	# timer): earlier suites leave it test_mode=true + CONNECTED, and a node
+	# leaked into the gdUnit tree polls SimBridge every frame — in that ambient
+	# state poll_snapshot() serves TestHarness mock snapshots whose ticks (~15+)
+	# get applied into GameState.current_tick during our awaits, out-running the
+	# fresh server's own ticks (1..5). send_input stamps current_tick into every
+	# wire entry and the server's InputQueue panics on non-monotonic ticks
+	# ("tick ordering violated"), so a single poisoned stamp kills the whole
+	# connection. Disconnected + live mode makes poll_snapshot() return null for
+	# the leaked poller until OUR server connects, after which the only applied
+	# snapshots are its own — monotonic by construction.
+	SimBridge.test_mode = false
+	SimBridge.state = SimBridge.ConnectionState.DISCONNECTED
+	SimBridge._bridge = null
+	_saved_current_tick = GameState.current_tick
+	GameState.current_tick = 0
+	# reset_test_state() clears neither of these, and both poison a fresh
+	# server connection the same way: a stale _last_snapshot gets consumed and
+	# applied right after connect, and stale _outbound_buffer entries flush to
+	# the new server carrying old tick stamps.
+	SimBridge._last_snapshot = null
+	SimBridge._outbound_buffer.clear()
+	InputMapper.input_queue.clear()
+	InputMapper._last_sent_octant = InputMapper.facing_octant
+	InputMapper._gameplay_occluded = false
+	InputMapper._suppress_move_until_release = false
+	_release_all_movement_keys()
+
+
+func after_test() -> void:
+	if SimBridge._bridge != null and SimBridge._bridge != _saved_bridge:
+		SimBridge._bridge.disconnect_from_server()
+	if _server_pid > 0 and OS.is_process_running(_server_pid):
+		OS.kill(_server_pid)
+	_server_pid = -1
+
+	if SimBridge.snapshot_received.is_connected(_on_snapshot_received):
+		SimBridge.snapshot_received.disconnect(_on_snapshot_received)
+	_captured_snapshot = null
+
+	SimBridge.test_mode = _saved_test_mode
+	SimBridge.state = _saved_state
+	SimBridge._bridge = _saved_bridge
+	SimBridge.server_path = _saved_server_path
+	SimBridge.server_port = _saved_server_port
+	# reset_test_state() touches only mock-side state (harness.reset() when a
+	# harness exists, star-map flag, SystemIndex cache) — inert for this live
+	# suite, but it restores whatever ambient mock the run left for later suites.
+	SimBridge.reset_test_state()
+	# Don't let MY servers' snapshots/inputs poison later suites either.
+	SimBridge._last_snapshot = null
+	SimBridge._outbound_buffer.clear()
+	GameState.current_tick = _saved_current_tick
+
+	InputMapper.input_queue.clear()
+	InputMapper._gameplay_occluded = false
+	InputMapper._suppress_move_until_release = false
+	_release_all_movement_keys()
+
+	HudGroups._active_app = ""
+	HudGroups._active_mode = HudGroups.Mode.GAMEPLAY
+	HudGroups._groups.erase(TEST_APP)
+
+
+func _release_all_movement_keys() -> void:
+	Input.action_release("move_north")
+	Input.action_release("move_south")
+	Input.action_release("move_east")
+	Input.action_release("move_west")
+
+
+## Drives SimBridge from DISCONNECTED all the way to CONNECTED against a
+## freshly spawned server, awaiting real frames so SimBridge's own _process()
+## (autoload, ticks automatically) does its TCP-connect + handshake dance.
+func _connect_live(server_path: String) -> bool:
+	var spawned := await _spawn_server(server_path)
+	assert_bool(spawned).override_failure_message(
+		"server spawn failed after %d port attempts" % MAX_PORT_ATTEMPTS
+	).is_true()
+	if not spawned:
+		return false
+
+	SimBridge.test_mode = false
+	SimBridge.server_path = ""  # already spawned ourselves — SimBridge must not spawn again
+	SimBridge.server_port = _test_port
+	SimBridge._bridge = null
+	SimBridge.state = SimBridge.ConnectionState.DISCONNECTED
+	if not SimBridge.snapshot_received.is_connected(_on_snapshot_received):
+		SimBridge.snapshot_received.connect(_on_snapshot_received)
+	SimBridge.connect_to_sim()
+
+	var deadline_ms: int = Time.get_ticks_msec() + int(CONNECT_TIMEOUT * 1000.0) * 2
+	while Time.get_ticks_msec() < deadline_ms:
+		if SimBridge.state == SimBridge.ConnectionState.CONNECTED:
+			return true
+		if SimBridge.state == SimBridge.ConnectionState.ERROR:
+			break
+		await get_tree().process_frame
+	return SimBridge.state == SimBridge.ConnectionState.CONNECTED
+
+
+## Find the player entity in a decoded snapshot Dictionary.
+static func _find_player(snapshot: Dictionary) -> Dictionary:
+	for entity in snapshot.get("entities", []):
+		if entity.kind.variant == "Player":
+			return entity
+	return {}
+
+
+## Wait for a snapshot (or the timeout). Two arrival paths, both required for
+## full-suite robustness (see _captured_snapshot): a direct poll_snapshot()
+## (wins when nothing else consumes), and the snapshot_received capture (wins
+## when a leaked node from an earlier suite consumes first). The explicit
+## SimBridge._process() pump keeps the TCP drain going even if ambient autoload
+## processing is starved; double-pumping alongside the ambient call is a no-op
+## (poll_message just drains an empty buffer).
+func _await_next_snapshot(timeout: float = RESPONSE_TIMEOUT) -> Dictionary:
+	var deadline_ms: int = Time.get_ticks_msec() + int(timeout * 1000.0)
+	while Time.get_ticks_msec() < deadline_ms:
+		SimBridge._process(0.016)
+		var snap: Variant = SimBridge.poll_snapshot()
+		if snap == null and _captured_snapshot != null:
+			snap = _captured_snapshot
+		_captured_snapshot = null
+		if snap != null:
+			return snap
+		await get_tree().process_frame
+	return {}
+
+
+func _on_snapshot_received(snapshot: Variant) -> void:
+	_captured_snapshot = snapshot
+
+
+## Mirrors main.gd's dispatch loop exactly for the actions this test exercises
+## (movement + SET_FACING): flush InputMapper's queue and forward each entry
+## to SimBridge.send_input(). main.gd's client-only continues (BUG_REPORT,
+## OPEN_JOURNAL, OPEN_MENU, INTERACT's target-resolution) are irrelevant here
+## since this test never presses those keys — nothing to special-case.
+func _flush_input_to_server() -> void:
+	var inputs: Array[Dictionary] = InputMapper.flush_queue()
+	for input in inputs:
+		SimBridge.send_input(input)
+
+
+## Drive InputMapper._process() + the flush-to-server forwarding for one
+## simulated frame, then await a real engine frame so SimBridge's own
+## _process() gets a chance to actually transmit the outbound buffer.
+func _tick(delta: float = 0.05) -> void:
+	InputMapper._process(delta)
+	_flush_input_to_server()
+	await get_tree().process_frame
+
+
+# -- Live: WASD held while a FULLSCREEN implant is open must not move the player --
+
+func test_wasd_held_during_implant_occlusion_does_not_move_player(
+	_do_skip := not FileAccess.file_exists(_server_binary_path()),
+	_skip_reason := "server binary not built — run `cargo build` in server/"
+) -> void:
+	var server_path := _server_binary_path()
+	var connected := await _connect_live(server_path)
+	assert_bool(connected).override_failure_message(
+		"live SimBridge connection to spawned server failed within timeout"
+	).is_true()
+	if not connected:
+		return
+
+	GameState.player_stance = "Walk"
+	InputMapper._last_move_msec = Time.get_ticks_msec() - 1000
+
+	# Baseline: proof-room player starts at (16,16) -> render coords (16.5, 16.5).
+	var baseline: Dictionary = await _await_next_snapshot()
+	var start_player := _find_player(baseline)
+	assert_that(start_player.size()).override_failure_message(
+		"must receive at least one snapshot with a Player entity before testing"
+	).is_greater(0)
+	if start_player.is_empty():
+		return  # gdUnit asserts don't halt — bail before dereferencing
+	var start_x: float = start_player.x
+	var start_y: float = start_player.y
+	assert_float(start_x).is_equal_approx(16.5, 0.001)
+	assert_float(start_y).is_equal_approx(16.5, 0.001)
+
+	# Open a FULLSCREEN implant screen — gameplay is now occluded.
+	HudGroups.open_app(TEST_APP, HudGroups.Mode.FULLSCREEN)
+	assert_bool(InputMapper._gameplay_occluded).override_failure_message(
+		"gate precondition: HudGroups.open_app(FULLSCREEN) must occlude gameplay"
+	).is_true()
+
+	# Hold W (move_north) and drive several ticks — comfortably past the Walk
+	# stance's 400ms move interval, so if the gate were absent this would have
+	# produced multiple MoveNorth sends by now.
+	Input.action_press("move_north")
+	for _i in range(20):
+		await _tick(0.05)
+	Input.action_release("move_north")
+
+	# Drain whatever the server actually streamed during the hold and confirm
+	# the player never left the starting tile. A timeout here is a FAILURE, not
+	# a fallback case: substituting baseline would compare baseline to itself
+	# and vacuously pass the very claim under test (Hoshe, PR #190 review).
+	var settle: Dictionary = await _await_next_snapshot(2.0)
+	assert_bool(not settle.is_empty()).override_failure_message(
+		"no snapshot arrived within 2s after the hold — cannot verify the no-movement claim"
+	).is_true()
+	if settle.is_empty():
+		return
+	var after_hold := _find_player(settle)
+	assert_that(after_hold.size()).is_greater(0)
+	if after_hold.is_empty():
+		return  # gdUnit asserts don't halt — bail before dereferencing
+	assert_float(after_hold.x).override_failure_message(
+		(
+			"player must NOT move while WASD is held during implant occlusion — x drifted from %.2f to %.2f"
+			% [start_x, after_hold.x]
+		)
+	).is_equal_approx(start_x, 0.001)
+	assert_float(after_hold.y).override_failure_message(
+		(
+			"player must NOT move while WASD is held during implant occlusion — y drifted from %.2f to %.2f"
+			% [start_y, after_hold.y]
+		)
+	).is_equal_approx(start_y, 0.001)
+
+
+# -- Live: close-while-held must not resume movement without a re-press --------
+
+func test_close_while_held_requires_repress_before_movement_resumes_live(
+	_do_skip := not FileAccess.file_exists(_server_binary_path()),
+	_skip_reason := "server binary not built — run `cargo build` in server/"
+) -> void:
+	var server_path := _server_binary_path()
+	var connected := await _connect_live(server_path)
+	assert_bool(connected).override_failure_message(
+		"live SimBridge connection to spawned server failed within timeout"
+	).is_true()
+	if not connected:
+		return
+
+	GameState.player_stance = "Walk"
+	InputMapper._last_move_msec = Time.get_ticks_msec() - 1000
+
+	var baseline: Dictionary = await _await_next_snapshot()
+	var start_player := _find_player(baseline)
+	assert_that(start_player.size()).override_failure_message(
+		"must receive at least one snapshot with a Player entity before testing"
+	).is_greater(0)
+	if start_player.is_empty():
+		return  # gdUnit asserts don't halt — bail before dereferencing
+	var start_x: float = start_player.x
+	var start_y: float = start_player.y
+
+	# Open the implant, hold W THROUGH the close transition (W is still down
+	# when close_app() fires — this is the "forgot their finger on W" case).
+	HudGroups.open_app(TEST_APP, HudGroups.Mode.FULLSCREEN)
+	Input.action_press("move_north")
+	for _i in range(6):
+		await _tick(0.05)
+
+	HudGroups.close_app()
+	assert_bool(InputMapper._suppress_move_until_release).override_failure_message(
+		"the release-latch must arm the instant the implant closes"
+	).is_true()
+
+	# Still held for several more ticks post-close — must NOT resume.
+	for _i in range(10):
+		await _tick(0.05)
+
+	# Timeout is a failure, not a fallback — see the sibling test's comment.
+	var settle_still_held: Dictionary = await _await_next_snapshot(2.0)
+	assert_bool(not settle_still_held.is_empty()).override_failure_message(
+		"no snapshot arrived within 2s after the held-through-close phase — cannot verify the no-resume claim"
+	).is_true()
+	if settle_still_held.is_empty():
+		return
+	var still_held_player := _find_player(settle_still_held)
+	assert_that(still_held_player.size()).is_greater(0)
+	if still_held_player.is_empty():
+		return  # gdUnit asserts don't halt — bail before dereferencing
+	assert_float(still_held_player.x).override_failure_message(
+		"player must NOT resume moving while W stays held through the close transition (no re-press yet)"
+	).is_equal_approx(start_x, 0.001)
+	assert_float(still_held_player.y).override_failure_message(
+		"player must NOT resume moving while W stays held through the close transition (no re-press yet)"
+	).is_equal_approx(start_y, 0.001)
+
+	# Release, then re-press — movement must resume normally now.
+	Input.action_release("move_north")
+	await _tick(0.05)  # observes the release, clears the latch
+	assert_bool(InputMapper._suppress_move_until_release).override_failure_message(
+		"the latch must clear once every movement key has been observed released"
+	).is_false()
+
+	InputMapper._last_move_msec = Time.get_ticks_msec() - 1000
+	Input.action_press("move_north")
+	var resumed := false
+	for _i in range(30):
+		await _tick(0.05)
+		var snap: Dictionary = await _await_next_snapshot(0.5)
+		if not snap.is_empty():
+			var p := _find_player(snap)
+			if (
+				p.size() > 0
+				and not (is_equal_approx(p.x, start_x) and is_equal_approx(p.y, start_y))
+			):
+				resumed = true
+				break
+	Input.action_release("move_north")
+	assert_bool(resumed).override_failure_message(
+		"movement must resume after a fresh re-press following the close-while-held transition"
+	).is_true()
diff --git a/client/tests/test_input_mapper_occlusion_gate.gd b/client/tests/test_input_mapper_occlusion_gate.gd
new file mode 100644
index 000000000..05cc0b5a0
--- /dev/null
+++ b/client/tests/test_input_mapper_occlusion_gate.gd
@@ -0,0 +1,406 @@
+## T-1146: implant-occlusion gate — InputMapper must not queue gameplay-sim-bound
+## actions (movement, SET_FACING, and every gated _unhandled_input entry) while
+## HudGroups.gameplay_occluded is true (a FULLSCREEN implant screen is open).
+## Implant/app-level keys (OPEN_MENU/BUG_REPORT/OPEN_JOURNAL) are the explicit
+## exception — they must keep working regardless of occlusion, since OPEN_MENU
+## is how the implant closes.
+##
+## Unit/state tier (this file): drives InputMapper._process()/_unhandled_input()
+## directly with real HudGroups.open_app()/close_app() transitions and real
+## Input.action_press()/action_release() engine-global state — no live server,
+## no scene tree beyond the autoloads. The LIVE tier (test_input_gate_live.gd,
+## sibling file) proves the same behavior end-to-end against a spawned server.
+class_name TestInputMapperOcclusionGate
+extends GdUnitTestSuite
+
+const TEST_APP := "implant/t1146_occlusion_test"
+
+# Ambient SimBridge state to restore in after_test — see the neutralization
+# comment in before_test.
+var _saved_sim_state: int = 0
+
+
+func before_test() -> void:
+	GameState.player_stance = "Walk"
+	GameState.dialogue_active = false
+	GameState.free_camera_mode = false
+	GameState.gauntlet_mode = false
+	# This suite never touches SimBridge, but every real open_app()/close_app()
+	# transition below fires HudGroups' global auto-pause handler, which calls
+	# SimBridge.send_named_action("AutoPause"/"AutoResume") — a silent append to
+	# the shared _outbound_buffer whenever ambient state is CONNECTED (which
+	# other suites leave behind, e.g. test_hub_teleport.gd sets CONNECTED with
+	# no after_test). Force DISCONNECTED for the duration so those sends no-op,
+	# and clear any entries already leaked into the buffer (Hoshe, PR #190).
+	_saved_sim_state = SimBridge.state
+	SimBridge.state = SimBridge.ConnectionState.DISCONNECTED
+	SimBridge._outbound_buffer.clear()
+	InputMapper.input_queue.clear()
+	InputMapper._gameplay_occluded = false
+	InputMapper._suppress_move_until_release = false
+	InputMapper._last_move_msec = 0
+	# D-054 movement is facing-relative, and _update_facing_from_mouse() derives
+	# facing from engine/session globals (viewport mouse position vs the
+	# GameState.player_position screen anchor under the live canvas transform) at
+	# the top of every _process. Earlier suites move all three, so in full-suite
+	# order "press W" can resolve to a diagonal (gate run: MOVE_NORTHWEST).
+	# Pin facing to North through the T-1088 provider seam so poll assertions
+	# are order-independent.
+	InputMapper.facing_angle_provider = func() -> float: return -PI / 2.0
+	InputMapper.facing_angle = -PI / 2.0
+	InputMapper.facing_octant = "North"
+	InputMapper._last_sent_octant = "North"
+	_release_all_movement_keys()
+
+
+func after_test() -> void:
+	SimBridge.state = _saved_sim_state
+	InputMapper.input_queue.clear()
+	InputMapper._gameplay_occluded = false
+	InputMapper._suppress_move_until_release = false
+	InputMapper.facing_angle_provider = Callable()
+	_release_all_movement_keys()
+	# Restore HudGroups to a clean gameplay state regardless of what a test left
+	# behind — mirrors test_implant_app_lifecycle.gd's after_test convention.
+	HudGroups._active_app = ""
+	HudGroups._active_mode = HudGroups.Mode.GAMEPLAY
+	HudGroups._groups.erase(TEST_APP)
+
+
+func _release_all_movement_keys() -> void:
+	Input.action_release("move_north")
+	Input.action_release("move_south")
+	Input.action_release("move_east")
+	Input.action_release("move_west")
+
+
+# A throttle-safe "now" — MOVE_INTERVAL_MS["Walk"] is 400ms; setting
+# _last_move_msec far enough in the past guarantees the next poll's interval
+# check passes regardless of real wall-clock time elapsed during the test.
+func _prime_throttle_ready() -> void:
+	InputMapper._last_move_msec = Time.get_ticks_msec() - 1000
+
+
+# =============================================================================
+# Occluded -> poll produces nothing (movement)
+# =============================================================================
+
+
+func test_occluded_movement_poll_queues_nothing() -> void:
+	HudGroups.open_app(TEST_APP, HudGroups.Mode.FULLSCREEN)
+	assert_bool(InputMapper._gameplay_occluded).override_failure_message(
+		"HudGroups.open_app(FULLSCREEN) must occlude — gate precondition not met"
+	).is_true()
+	_prime_throttle_ready()
+	Input.action_press("move_north")
+	InputMapper._process(0.016)
+	assert_int(InputMapper.input_queue.size()).override_failure_message(
+		"InputMapper must not enqueue MoveNorth while gameplay is occluded"
+	).is_equal(0)
+
+
+func test_occluded_set_facing_poll_queues_nothing() -> void:
+	# Force a facing_octant change so the (ungated in isolation) SET_FACING send
+	# branch would fire if the occlusion gate were not in place.
+	InputMapper.facing_angle = 0.0  # East
+	InputMapper.facing_octant = "East"
+	InputMapper._last_sent_octant = "North"
+	HudGroups.open_app(TEST_APP, HudGroups.Mode.FULLSCREEN)
+	InputMapper._process(0.016)
+	assert_int(InputMapper.input_queue.size()).override_failure_message(
+		"InputMapper must not enqueue SetFacing while gameplay is occluded"
+	).is_equal(0)
+
+
+# =============================================================================
+# Occluded -> _unhandled_input produces nothing for gameplay-sim-bound actions
+# =============================================================================
+
+
+func test_occluded_interact_press_queues_nothing() -> void:
+	HudGroups.open_app(TEST_APP, HudGroups.Mode.FULLSCREEN)
+	var fake_event := InputEventAction.new()
+	fake_event.action = "interact"
+	fake_event.pressed = true
+	InputMapper._unhandled_input(fake_event)
+	assert_int(InputMapper.input_queue.size()).override_failure_message(
+		"InputMapper must not enqueue Interact while gameplay is occluded"
+	).is_equal(0)
+
+
+func test_occluded_stance_up_press_queues_nothing() -> void:
+	HudGroups.open_app(TEST_APP, HudGroups.Mode.FULLSCREEN)
+	var fake_event := InputEventAction.new()
+	fake_event.action = "stance_up"
+	fake_event.pressed = true
+	InputMapper._unhandled_input(fake_event)
+	assert_int(InputMapper.input_queue.size()).override_failure_message(
+		"InputMapper must not enqueue TOGGLE_STANCE_UP while gameplay is occluded"
+	).is_equal(0)
+
+
+func test_occluded_quicksave_press_queues_nothing() -> void:
+	GameState.current_game_id = "t1146-test-session"
+	HudGroups.open_app(TEST_APP, HudGroups.Mode.FULLSCREEN)
+	var fake_event := InputEventAction.new()
+	fake_event.action = "quicksave"
+	fake_event.pressed = true
+	InputMapper._unhandled_input(fake_event)
+	assert_int(InputMapper.input_queue.size()).override_failure_message(
+		"InputMapper must not enqueue SaveGame while gameplay is occluded"
+	).is_equal(0)
+	GameState.current_game_id = ""
+
+
+# =============================================================================
+# Exempt actions — never gated, regardless of occlusion
+# =============================================================================
+
+
+func test_occluded_open_menu_press_still_queues() -> void:
+	# OPEN_MENU is how the implant CLOSES (Esc). Gating it would make the
+	# implant impossible to close with the keyboard.
+	HudGroups.open_app(TEST_APP, HudGroups.Mode.FULLSCREEN)
+	var fake_event := InputEventAction.new()
+	fake_event.action = "open_menu"
+	fake_event.pressed = true
+	InputMapper._unhandled_input(fake_event)
+	assert_int(InputMapper.input_queue.size()).override_failure_message(
+		"OPEN_MENU must still queue while gameplay is occluded — it's how the implant closes"
+	).is_equal(1)
+	assert_int(InputMapper.input_queue[0]["action"]).is_equal(InputMapper.Action.OPEN_MENU)
+
+
+func test_occluded_bug_report_press_still_queues() -> void:
+	# #495: client-only, never reaches send_input — no reason to gate it.
+	HudGroups.open_app(TEST_APP, HudGroups.Mode.FULLSCREEN)
+	var fake_event := InputEventAction.new()
+	fake_event.action = "bug_report"
+	fake_event.pressed = true
+	InputMapper._unhandled_input(fake_event)
+	assert_int(InputMapper.input_queue.size()).override_failure_message(
+		"BUG_REPORT must still queue while gameplay is occluded — it's client-only"
+	).is_equal(1)
+	assert_int(InputMapper.input_queue[0]["action"]).is_equal(InputMapper.Action.BUG_REPORT)
+
+
+func test_occluded_open_journal_press_still_queues() -> void:
+	# #264: client-only, never reaches send_input — no reason to gate it.
+	HudGroups.open_app(TEST_APP, HudGroups.Mode.FULLSCREEN)
+	var fake_event := InputEventAction.new()
+	fake_event.action = "open_journal"
+	fake_event.pressed = true
+	InputMapper._unhandled_input(fake_event)
+	assert_int(InputMapper.input_queue.size()).override_failure_message(
+		"OPEN_JOURNAL must still queue while gameplay is occluded — it's client-only"
+	).is_equal(1)
+	assert_int(InputMapper.input_queue[0]["action"]).is_equal(InputMapper.Action.OPEN_JOURNAL)
+
+
+# =============================================================================
+# Unoccluded -> poll produces normally
+# =============================================================================
+
+
+func test_unoccluded_movement_poll_queues_normally() -> void:
+	assert_bool(InputMapper._gameplay_occluded).is_false()
+	_prime_throttle_ready()
+	Input.action_press("move_north")
+	InputMapper._process(0.016)
+	assert_int(InputMapper.input_queue.size()).override_failure_message(
+		"InputMapper must enqueue MoveNorth normally while gameplay is not occluded"
+	).is_equal(1)
+	assert_int(InputMapper.input_queue[0]["action"]).is_equal(InputMapper.Action.MOVE_NORTH)
+
+
+func test_unoccluded_interact_press_queues_normally() -> void:
+	var fake_event := InputEventAction.new()
+	fake_event.action = "interact"
+	fake_event.pressed = true
+	InputMapper._unhandled_input(fake_event)
+	assert_int(InputMapper.input_queue.size()).override_failure_message(
+		"InputMapper must enqueue Interact normally while gameplay is not occluded"
+	).is_equal(1)
+	assert_int(InputMapper.input_queue[0]["action"]).is_equal(InputMapper.Action.INTERACT)
+
+
+# =============================================================================
+# T-1088 click-to-move seams share the same suppression predicate — all three
+# input_queue producers in the module are gated (Tyre, PR #190 review)
+# =============================================================================
+
+
+func test_occluded_queue_move_step_queues_nothing() -> void:
+	InputMapper._gameplay_occluded = true
+	_prime_throttle_ready()
+	var queued := InputMapper.queue_move_step(Vector2i(0, -1))
+	assert_bool(queued).is_false()
+	assert_int(InputMapper.input_queue.size()).override_failure_message(
+		"queue_move_step must not enqueue while gameplay is occluded"
+	).is_equal(0)
+
+
+func test_occluded_queue_stance_toggle_queues_nothing() -> void:
+	InputMapper._gameplay_occluded = true
+	InputMapper.queue_stance_toggle(true)
+	assert_int(InputMapper.input_queue.size()).override_failure_message(
+		"queue_stance_toggle must not enqueue while gameplay is occluded"
+	).is_equal(0)
+
+
+func test_unoccluded_seams_queue_normally() -> void:
+	_prime_throttle_ready()
+	var queued := InputMapper.queue_move_step(Vector2i(0, -1))
+	assert_bool(queued).is_true()
+	InputMapper.queue_stance_toggle(true)
+	assert_int(InputMapper.input_queue.size()).override_failure_message(
+		"both seams must keep queueing normally while gameplay is not occluded"
+	).is_equal(2)
+	assert_int(InputMapper.input_queue[0]["action"]).is_equal(InputMapper.Action.MOVE_NORTH)
+	assert_int(InputMapper.input_queue[1]["action"]).is_equal(InputMapper.Action.TOGGLE_STANCE_UP)
+
+
+# =============================================================================
+# INSERT mode must NOT occlude/gate — e.g. main.gd's "implant/economics" panel
+# (D-181/#824) renders alongside still-playable gameplay.
+# =============================================================================
+
+
+func test_insert_mode_does_not_occlude() -> void:
+	HudGroups.open_app(TEST_APP, HudGroups.Mode.INSERT)
+	assert_bool(InputMapper._gameplay_occluded).override_failure_message(
+		"INSERT mode must not set gameplay_occluded — it's a side panel, gameplay stays playable"
+	).is_false()
+
+
+func test_insert_mode_movement_poll_queues_normally() -> void:
+	HudGroups.open_app(TEST_APP, HudGroups.Mode.INSERT)
+	_prime_throttle_ready()
+	Input.action_press("move_east")
+	InputMapper._process(0.016)
+	assert_int(InputMapper.input_queue.size()).override_failure_message(
+		"WASD must still move the character while an INSERT-mode panel (e.g. economics monitor) is open"
+	).is_equal(1)
+
+
+# =============================================================================
+# Held-state transitions (T-1146 requirement #2)
+# =============================================================================
+
+
+## Open-while-held: a movement key already down when the implant opens must
+## stop producing on the very next poll — no separate latch needed, the
+## occlusion gate alone is sufficient since poll-site means nothing is ever
+## enqueued once occluded.
+func test_open_while_held_stops_movement_immediately() -> void:
+	_prime_throttle_ready()
+	Input.action_press("move_north")
+	InputMapper._process(0.016)
+	assert_int(InputMapper.input_queue.size()).override_failure_message(
+		"sanity: movement must queue before occlusion begins"
+	).is_equal(1)
+	InputMapper.input_queue.clear()
+
+	# Implant opens WHILE W is still held.
+	HudGroups.open_app(TEST_APP, HudGroups.Mode.FULLSCREEN)
+	InputMapper._process(0.016)
+	assert_int(InputMapper.input_queue.size()).override_failure_message(
+		"movement must stop the instant occlusion begins, even with the key still held"
+	).is_equal(0)
+
+
+## Close-while-held: a movement key still down at the moment the implant
+## closes must NOT resume movement on the very next poll — a re-press is
+## required. This is the release-latch (_suppress_move_until_release).
+func test_close_while_held_does_not_resume_without_release() -> void:
+	HudGroups.open_app(TEST_APP, HudGroups.Mode.FULLSCREEN)
+	_prime_throttle_ready()
+	Input.action_press("move_north")  # held throughout the whole close transition
+	InputMapper._process(0.016)
+	assert_int(InputMapper.input_queue.size()).override_failure_message(
+		"sanity: nothing should queue yet — still occluded"
+	).is_equal(0)
+
+	HudGroups.close_app()
+	assert_bool(InputMapper._suppress_move_until_release).override_failure_message(
+		"the release-latch must arm the instant occlusion ends"
+	).is_true()
+
+	_prime_throttle_ready()
+	InputMapper._process(0.016)  # W is STILL held — must not resume
+	assert_int(InputMapper.input_queue.size()).override_failure_message(
+		"W held through the close transition must NOT resume movement without a re-press"
+	).is_equal(0)
+
+	# Still held on a second poll — latch must not self-clear from time alone.
+	_prime_throttle_ready()
+	InputMapper._process(0.016)
+	assert_int(InputMapper.input_queue.size()).override_failure_message(
+		"the latch must not clear on its own while the key stays held"
+	).is_equal(0)
+
+	# Release, then re-press — movement must resume normally.
+	Input.action_release("move_north")
+	InputMapper._process(0.016)  # observes the release, clears the latch
+	assert_bool(InputMapper._suppress_move_until_release).override_failure_message(
+		"the latch must clear once the poll observes every movement key released"
+	).is_false()
+
+	_prime_throttle_ready()
+	Input.action_press("move_north")
+	InputMapper._process(0.016)
+	assert_int(InputMapper.input_queue.size()).override_failure_message(
+		"a fresh press after release must resume movement normally"
+	).is_equal(1)
+
+
+## Facing is exempt from the release-latch — turning to look on the frame the
+## implant closes is expected (re-sync), not a "lurch". Installs the T-1088
+## facing_angle_provider seam so _update_facing_from_mouse() cannot silently
+## overwrite the test's facing_octant from the headless-runner's real (and
+## arbitrary) mouse/viewport state before the SET_FACING check runs.
+func test_close_while_held_still_allows_facing_update_after_movement_key_release() -> void:
+	InputMapper.facing_angle_provider = func() -> float: return -PI / 2.0  # North
+	HudGroups.open_app(TEST_APP, HudGroups.Mode.FULLSCREEN)
+	InputMapper._process(0.016)  # settle facing_octant to North, consume any pending SET_FACING
+	InputMapper.input_queue.clear()
+	HudGroups.close_app()
+
+	# No movement key held at all — latch arms but has nothing to suppress;
+	# a facing change must still send normally on the very next poll.
+	InputMapper.facing_angle_provider = func() -> float: return 0.0  # East
+	InputMapper._process(0.016)
+	assert_int(InputMapper.input_queue.size()).override_failure_message(
+		"SET_FACING must send normally right after occlusion ends when no movement key is held"
+	).is_equal(1)
+	assert_int(InputMapper.input_queue[0]["action"]).is_equal(InputMapper.Action.SET_FACING)
+	InputMapper.facing_angle_provider = Callable()
+
+
+## The latch is scoped to raw_dir == ZERO across ALL four movement keys, not
+## just the one that was held when occlusion began — releasing a DIFFERENT
+## key than the one held at close-time must not falsely clear the latch while
+## another movement key is still down.
+func test_close_while_held_latch_requires_every_movement_key_released() -> void:
+	HudGroups.open_app(TEST_APP, HudGroups.Mode.FULLSCREEN)
+	Input.action_press("move_north")
+	Input.action_press("move_east")
+	HudGroups.close_app()
+
+	# Release only one of the two held keys.
+	Input.action_release("move_north")
+	_prime_throttle_ready()
+	InputMapper._process(0.016)
+	assert_bool(InputMapper._suppress_move_until_release).override_failure_message(
+		"the latch must stay armed while ANY movement key is still held"
+	).is_true()
+	assert_int(InputMapper.input_queue.size()).override_failure_message(
+		"movement must stay suppressed while any movement key is still held"
+	).is_equal(0)
+
+	# Release the second key — now all movement keys are up.
+	Input.action_release("move_east")
+	InputMapper._process(0.016)
+	assert_bool(InputMapper._suppress_move_until_release).override_failure_message(
+		"the latch must clear once every movement key has been released"
+	).is_false()