Prevent generated resources from being serialized in the `.tscn`

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You can remove the resources in the Node.NOTIFICATION_EDITOR_PRE_SAVE and add them again in the Node.NOTIFICATION_EDITOR_POST_SAVE

Example:

@tool
extends Node


var my_procedural_mesh:Mesh


func _ready() -> void:
	my_procedural_mesh = BoxMesh.new()
	$MeshInstance3D.mesh = my_procedural_mesh


func _notification(what:int) -> void:
	match what:
		NOTIFICATION_EDITOR_PRE_SAVE:
			$MeshInstance3D.mesh = null
		NOTIFICATION_EDITOR_POST_SAVE:
			$MeshInstance3D.mesh = my_procedural_mesh