### 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)

path = p_path;
}
String SceneState::get_path() const {
	return path;
}
void SceneState::clear() {
	names.clear();
	variants.clear();
	nodes.clear();
	connections.clear();
	node_path_cache.clear();
	node_paths.clear();
	editable_instances.clear();
	base_scene_idx = -1;
}
Error SceneState::copy_from(const Ref<SceneState> &p_scene_state) {