### 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)

const String property_name = basename + vformat("/layer_%d", p_index + 1);
	if (ProjectSettings::get_singleton()->has_setting(property_name)) {
		ProjectSettings::get_singleton()->set(property_name, p_name);
		ProjectSettings::get_singleton()->save();
	}
}
String EditorPropertyLayers::get_layer_name(int p_index) const {
	const String property_name = basename + vformat("/layer_%d", p_index + 1);
	if (ProjectSettings::get_singleton()->has_setting(property_name)) {
		return GLOBAL_GET(property_name);
	}
	return String();
}
void EditorPropertyLayers::_button_pressed() {