### 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)

emit_changed(get_edited_property(), p_locale);
	update_property();
}
void EditorPropertyLocale::_locale_pressed() {
	if (!dialog) {
		dialog = memnew(EditorLocaleDialog);
		dialog->connect("locale_selected", callable_mp(this, &EditorPropertyLocale::_locale_selected));
		add_child(dialog);
	}
	String locale_code = get_edited_property_value();
	dialog->set_locale(locale_code);
	dialog->popup_locale_dialog();
}
void EditorPropertyLocale::update_property() {
	String locale_code = get_edited_property_value();
	locale->set_text(locale_code);
	locale->set_tooltip_text(locale_code);
}
void EditorPropertyLocale::setup(const String &p_hint_text) {
}
void EditorPropertyLocale::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_ENTER_TREE:
		case NOTIFICATION_THEME_CHANGED: {
			locale_edit->set_icon(get_theme_icon(SNAME("Translation"), SNAME("EditorIcons")));
		} break;
	}
}
void EditorPropertyLocale::_locale_focus_exited() {