### Godot version

4.0-rc6

### System information

Fedora 37, Mesa Intel ADL GT2

### Issue description

Code that works as expected at runtime fails with Nil references to (assigned) exported vars in the editor:

![tool_global_position_error](https://user-images.githubusercontent.com/364501/222031460-ffb1ecbd-5175-4a42-8470-25285ba5f821.png)


### Steps to reproduce

Try to access the `global_position` of a `Node3D` that's assigned to an exported var.

See that it works at runtime.

See that it errors in the editor with:

> Invalid get index 'global_position' (on base: 'Nil').

### Minimal reproduction project

[tool_test.zip](https://github.com/godotengine/godot/files/10856640/tool_test.zip)

return state->get_bundled_scene();
}
Error PackedScene::pack(Node *p_scene) {
	return state->pack(p_scene);
}
void PackedScene::clear() {
	state->clear();
}
void PackedScene::reload_from_file() {
	String path = get_path();
	if (!path.is_resource_file()) {
		return;
	}
	Ref<PackedScene> s = ResourceLoader::load(ResourceLoader::path_remap(path), get_class(), ResourceFormatLoader::CACHE_MODE_IGNORE);
	if (!s.is_valid()) {
		return;
	}
	
	Ref<SceneState> loaded_state = s->get_state();
	
	
	s->recreate_state();
	
	copy_from(s);
	
	state->copy_from(loaded_state);
}
bool PackedScene::can_instantiate() const {