diff --git a/game/presentation/views/board_view.gd b/game/presentation/views/board_view.gd
index e9bd731c..20399c61 100644
--- a/game/presentation/views/board_view.gd
+++ b/game/presentation/views/board_view.gd
@@ -231,7 +231,9 @@ func _update_world_size() -> void:
 		return
 	var px := Vector2(_board.width, _board.height) * (_cell + float(SEP)) - Vector2(SEP, SEP)
 	_svp_container.custom_minimum_size = px
-	_viewport.size = px   # 树内 stretch=true 由容器回写同值；树外（冒烟直建）此处保 1:1
+	# 树内 stretch=true 时 SubViewport 尺寸由容器接管（手设被引擎拒绝并刷警告）；树外（冒烟直建）才需手设保 1:1
+	if not _svp_container.is_inside_tree():
+		_viewport.size = px
 
 
 # 真实输入路径（ADR-0006 Decision 3）：壳层 _gui_input → 板级公式换算 → 复用既有 hover/点选/chord 出口