### Godot version

4.2 f5696c3

### System information

Windows 10 x64

### Issue description

![image](https://github.com/godotengine/godot/assets/2223172/7ad0e3b6-9599-4f7b-a07c-da54779e647a)


### Steps to reproduce

1. Add node
2. Attach a built-in script
3. Add child node
4. Add script to the child node
5. In some method write `get_parent().bui`

### Minimal reproduction project

N/A
if (ClassDB::class_exists(p_symbol)) {
		r_result.type = ScriptLanguage::LOOKUP_RESULT_CLASS;
		r_result.class_name = p_symbol;
		return OK;
	}
	for (int i = 0; i < Variant::VARIANT_MAX; i++) {
		Variant::Type t = Variant::Type(i);
		if (Variant::get_type_name(t) == p_symbol) {
			r_result.type = ScriptLanguage::LOOKUP_RESULT_CLASS;
			r_result.class_name = Variant::get_type_name(t);
			return OK;
		}
	}