### 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)

set_bottom_editor(nullptr);
			memdelete(container);
			button_add_item = nullptr;
			container = nullptr;
		}
	}
}
void EditorPropertyLocalizableString::_object_id_selected(const StringName &p_property, ObjectID p_id) {
	emit_signal(SNAME("object_id_selected"), p_property, p_id);
}
void EditorPropertyLocalizableString::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_THEME_CHANGED:
		case NOTIFICATION_ENTER_TREE: {
			if (button_add_item) {
				button_add_item->set_icon(get_theme_icon(SNAME("Add"), SNAME("EditorIcons")));
			}
		} break;
	}
}
void EditorPropertyLocalizableString::_edit_pressed() {
	Variant prop_val = get_edited_property_value();
	if (prop_val.get_type() == Variant::NIL && edit->is_pressed()) {
		VariantInternal::initialize(&prop_val, Variant::DICTIONARY);
		get_edited_object()->set(get_edited_property(), prop_val);
	}
	get_edited_object()->editor_set_section_unfold(get_edited_property(), edit->is_pressed());
	update_property();
}
void EditorPropertyLocalizableString::_page_changed(int p_page) {