### 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;
		}
		float required_y_distance = 20.0f * EDSCALE;
		if (ABS(reorder_mouse_y_delta) > required_y_distance) {
			int direction = reorder_mouse_y_delta > 0.0f ? 1 : -1;
			reorder_mouse_y_delta -= required_y_distance * direction;
			reorder_to_index += direction;
			if ((direction < 0 && reorder_to_index % page_length == page_length - 1) || (direction > 0 && reorder_to_index % page_length == 0)) {
				
				_page_changed(page_index + direction);
			}
			property_vbox->move_child(reorder_selected_element_hbox, reorder_to_index % page_length);
			
			InspectorDock::get_inspector_singleton()->ensure_control_visible(reorder_selected_element_hbox);
		}
	}
}
void EditorPropertyArray::_reorder_button_down(int p_index) {
	if (is_read_only()) {
		return;
	}
	reorder_from_index = p_index;
	reorder_to_index = p_index;
	reorder_selected_element_hbox = Object::cast_to<HBoxContainer>(property_vbox->get_child(p_index % page_length));
	reorder_selected_button = Object::cast_to<Button>(reorder_selected_element_hbox->get_child(0));
	
	
	Input::get_singleton()->set_mouse_mode(Input::MOUSE_MODE_CAPTURED);
}
void EditorPropertyArray::_reorder_button_up() {