diff --git a/src/game/engine/scenes/tests/gameplay_arc_proof.gd b/src/game/engine/scenes/tests/gameplay_arc_proof.gd
index 5530d6d4..24eb5574 100644
--- a/src/game/engine/scenes/tests/gameplay_arc_proof.gd
+++ b/src/game/engine/scenes/tests/gameplay_arc_proof.gd
@@ -223,18 +223,15 @@ func _ready() -> void:
 
 
 func _capture_step(label: String, mode: String, focus: Vector2i = Vector2i.ZERO) -> void:
-	_sync_renderers()
 	if mode == "focus":
 		_focus_camera(focus, 5.0 * 384.0)
 	else:
 		_setup_camera_fit()
-	# Wait two real frames-rendered to flush the GPU composite. process_frame
-	# fires before draw; frame_post_draw fires AFTER GPU composite, which is
-	# what `get_viewport().get_texture()` actually reads.
-	for _i: int in range(3):
-		await get_tree().process_frame
-	for _j: int in range(2):
-		await RenderingServer.frame_post_draw
+	_sync_renderers()
+	# Wall-clock wait so every queued canvas redraw and the camera transform
+	# both flush through the GPU composite before we read the texture.
+	# process_frame fires BEFORE draw; only a real timer hands the GPU time.
+	await get_tree().create_timer(0.5).timeout
 	var image: Image = get_viewport().get_texture().get_image()
 	if image == null:
 		push_error("gameplay_arc: viewport image null at %s" % label)