Fixed UI system

scripts/UI/SubsceneUI.gd

@@ -0,0 +1,15 @@
+class_name SubsceneUI extends Control
+
+@export var layer:UISystem.Layer = UISystem.Layer.Game;
+var originalParent:Node = null
+
+func _ready() -> void:
+	originalParent = self.get_parent()
+	originalParent.tree_exiting.connect(onParentExiting)
+	UI.addSubscene(self, layer)
+
+func onParentExiting() -> void:
+	if originalParent:
+		originalParent.tree_exiting.disconnect(onParentExiting)
+	UI.removeSubscene(self)
+	originalParent = null

scripts/UI/SubsceneUI.gd.uid

@@ -0,0 +1 @@
+uid://x3cc7wsnn0xd