### 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)

}
	}
	for (int i = 0; i < p_node->get_child_count(); i++) {
		Node *c = p_node->get_child(i);
		Error err = _parse_connections(p_owner, c, name_map, variant_map, node_map, nodepath_map);
		if (err) {
			return err;
		}
	}
	return OK;
}
Error SceneState::pack(Node *p_scene) {
	ERR_FAIL_NULL_V(p_scene, ERR_INVALID_PARAMETER);
	clear();
	Node *scene = p_scene;
	HashMap<StringName, int> name_map;
	HashMap<Variant, int, VariantHasher, VariantComparator> variant_map;
	HashMap<Node *, int> node_map;
	HashMap<Node *, int> nodepath_map;
	
	if (scene->get_scene_inherited_state().is_valid()) {
		String scene_path = scene->get_scene_inherited_state()->get_path();
		Ref<PackedScene> instance = ResourceLoader::load(scene_path);
		if (instance.is_valid()) {
			base_scene_idx = _vm_get_variant(instance, variant_map);
		}
	}
	
	Error err = _parse_node(scene, scene, -1, name_map, variant_map, node_map, nodepath_map);
	if (err) {