Editing child nodes of newly created packed scenes and saving thier changes with or without enabling editable_children in script for version 3.5

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Godot Version

Question

How to enable editable_children on a new instance of a packed scene (Level Object). The level object has child nodes which I am able to select and change the global position of in the editor. This packed scene will be added to another packed scene (Level). I have set the owners to the level objects and thier children, but open saving the level before playtesting through a button click, The child node of the level object resets it’s position. I have anually enabled editable_children to that level object in the level editor and it works. I would like acess to this feature in script using godot 3.5. I have seen this function in 4.0 but not in 3.5 and I cant upgrade since my project is large. This is an urgent request, help is much appreciated.

EditorPauseMenu.gd → Script responsible for saving the PackedScene Level

	var packed_scene = PackedScene.new()
	for child in get_parent().get_parent().get_node("Level").get_children():
		if child.owner == null:
			# children of this child are not saving thier modifications
			# like thier global_position
			child.owner = get_parent().get_parent().get_node("Level") 
	packed_scene.pack(get_parent().get_parent().get_node("Level"))
	var err = ResourceSaver.save(Globals.Editor_CurrentLocalLevelFileName, packed_scene)

Level Editor.gd

if MoveableObject != null:
		if MoveableObject.PortalDestinationClicked:
			MoveableObject.get_node("PortalExit").global_position = get_global_mouse_position()

if MoveableObject == null:
				var results2 = space_state.intersect_point(get_global_mouse_position(), 32, [], Globals.ChildObjectSelectionWithMouseLayer, false, true)
				if results2.size() > 0:
					var object2 = get_topmost_object(results2)
					MoveableObject = object2
					MoveableObject.PortalDestinationClicked = not MoveableObject.PortalDestinationClicked
			else:
				MoveableObject.PortalDestinationClicked = not MoveableObject.PortalDestinationClicked

Portal.gd

extends Node2D

var selected = false
var PortalDestinationClicked = false
		

func select():
	if get_parent().get_parent().EDIT_MODE == "SELECT":
		get_parent().get_parent().Selected_Object = self
		selected = true
	
	
func unselect():
	if get_parent().get_parent().EDIT_MODE == "SELECT":
		get_parent().get_parent().Selected_Object = null
		selected = false