### 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)

if (p_property.begins_with("indices")) {
		int index = p_property.get_slice("/", 1).to_int();
		Dictionary dict = object->get_dict().duplicate();
		Variant key = dict.get_key_at_index(index);
		dict[key] = p_value;
		object->set_dict(dict);
		emit_changed(get_edited_property(), dict, "", true);
	}
}
void EditorPropertyLocalizableString::_add_locale_popup() {
	locale_select->popup_locale_dialog();
}
void EditorPropertyLocalizableString::_add_locale(const String &p_locale) {
	Dictionary dict = object->get_dict().duplicate();
	object->set_new_item_key(p_locale);
	object->set_new_item_value(String());
	dict[object->get_new_item_key()] = object->get_new_item_value();
	emit_changed(get_edited_property(), dict, "", false);
	update_property();
}
void EditorPropertyLocalizableString::_remove_item(Object *p_button, int p_index) {