### 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 _is_drop_valid(p_data);
}
void EditorPropertyArray::drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from) {
	ERR_FAIL_COND(!_is_drop_valid(p_data));
	Dictionary drag_data = p_data;
	if (drag_data.has("type") && String(drag_data["type"]) == "files") {
		Vector<String> files = drag_data["files"];
		Variant array = object->get_array();
		
		if (!array.is_array()) {
			initialize_array(array);
		} else {
			array = array.duplicate();
		}
		
		for (int i = 0; i < files.size(); i++) {
			String file = files[i];
			Ref<Resource> res = ResourceLoader::load(file);
			if (res.is_valid()) {
				array.call("push_back", res);
			}
		}
		emit_changed(get_edited_property(), array, "", false);
		update_property();
	}
}
void EditorPropertyArray::_notification(int p_what) {