Исправление. E 0:00:05:248 settings-toggle.gd:11 @ _exit_tree(): Attempt to disconnect a nonexistent connection from '<ProjectSettings#486539292>'. Signal: 'settings_changed', callable: 'LineEdit(settings-toggle.gd)::apply_colors'.

<Ошибка C++>  Condition "!s->slot_map.has(*p_callable.get_base_comparator())" is true. Returning: false
  <Исходный код C++>core/object/object.cpp:1529 @ _disconnect()
  <Трассировка стека>settings-toggle.gd:11 @ _exit_tree()

table/settings-toggle.gd

@@ -3,14 +3,10 @@ extends LineEdit
 var checkbutton_material: Material
 
 
-func _enter_tree() -> void:
+func _ready() -> void:
     ProjectSettings.connect('settings_changed', on_setting_changed)
 
 
-func _exit_tree() -> void:
-    ProjectSettings.disconnect('settings_changed', apply_colors)
-
-
 func on_setting_changed():
     var cb = $CheckButton
     checkbutton_material = cb.material