### 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 (updating) {
		return;
	}
	page_index = p_page;
	update_property();
}
void EditorPropertyLocalizableString::_bind_methods() {
}
EditorPropertyLocalizableString::EditorPropertyLocalizableString() {
	object.instantiate();
	page_length = int(EDITOR_GET("interface/inspector/max_array_dictionary_items_per_page"));
	edit = memnew(Button);
	edit->set_h_size_flags(SIZE_EXPAND_FILL);
	edit->set_clip_text(true);
	edit->connect("pressed", callable_mp(this, &EditorPropertyLocalizableString::_edit_pressed));
	edit->set_toggle_mode(true);
	add_child(edit);
	add_focusable(edit);
	container = nullptr;
	button_add_item = nullptr;
	paginator = nullptr;
	updating = false;
	locale_select = memnew(EditorLocaleDialog);
	locale_select->connect("locale_selected", callable_mp(this, &EditorPropertyLocalizableString::_add_locale));
	add_child(locale_select);
}