### 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)

}
EditorPropertyNil::EditorPropertyNil() {
	Label *prop_label = memnew(Label);
	prop_label->set_text("<null>");
	add_child(prop_label);
}
void EditorPropertyText::_set_read_only(bool p_read_only) {
	text->set_editable(!p_read_only);
}
void EditorPropertyText::_text_submitted(const String &p_string) {
	if (updating) {
		return;
	}
	if (text->has_focus()) {
		text->release_focus();
		_text_changed(p_string);
	}
}
void EditorPropertyText::_text_changed(const String &p_string) {
	if (updating) {
		return;
	}
	if (string_name) {
		emit_changed(get_edited_property(), StringName(p_string));
	} else {
		emit_changed(get_edited_property(), p_string);
	}
}
void EditorPropertyText::update_property() {