### 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)

_locale_selected(locale->get_text());
}
void EditorPropertyLocale::_bind_methods() {
}
EditorPropertyLocale::EditorPropertyLocale() {
	HBoxContainer *locale_hb = memnew(HBoxContainer);
	add_child(locale_hb);
	locale = memnew(LineEdit);
	locale_hb->add_child(locale);
	locale->connect("text_submitted", callable_mp(this, &EditorPropertyLocale::_locale_selected));
	locale->connect("focus_exited", callable_mp(this, &EditorPropertyLocale::_locale_focus_exited));
	locale->set_h_size_flags(SIZE_EXPAND_FILL);
	locale_edit = memnew(Button);
	locale_edit->set_clip_text(true);
	locale_hb->add_child(locale_edit);
	add_focusable(locale);
	dialog = nullptr;
	locale_edit->connect("pressed", callable_mp(this, &EditorPropertyLocale::_locale_pressed));
}
void EditorPropertyPath::_set_read_only(bool p_read_only) {
	path->set_editable(!p_read_only);
	path_edit->set_disabled(p_read_only);
}
void EditorPropertyPath::_path_selected(const String &p_path) {
	emit_changed(get_edited_property(), p_path);
	update_property();
}
void EditorPropertyPath::_path_pressed() {