diff --git a/src/game/engine/tests/unit/ai/test_ai_turn_bridge_stats.gd b/src/game/engine/tests/unit/ai/test_ai_turn_bridge_stats.gd
index be4e88ee..4d5fa95c 100644
--- a/src/game/engine/tests/unit/ai/test_ai_turn_bridge_stats.gd
+++ b/src/game/engine/tests/unit/ai/test_ai_turn_bridge_stats.gd
@@ -26,6 +26,10 @@ func before_each() -> void:
 	GameState.players = []
 	GameState.layers = [{"units": []}]
 	GameState.turn_number = 50
+	# _mcts_stats_log is static and leaks across tests; get_last_mcts_stats does a
+	# most-recent-at-or-before-turn lookup, so a prior test's player-0 entry would
+	# mask the heuristic sentinel. Clear it for deterministic isolation.
+	BridgeScript._mcts_stats_log.clear()
 
 
 func after_each() -> void: