### 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
break;
			case GDScriptParser::DataType::SCRIPT: {
				Ref<Script> scr = base_type.script_type;
				if (scr.is_valid()) {
					List<MethodInfo> methods;
					scr->get_script_method_list(&methods);
					for (const MethodInfo &mi : methods) {
						if (mi.name == p_method) {
							r_type = _type_from_property(mi.return_val);
							return true;
						}
					}
					Ref<Script> base_script = scr->get_base_script();
					if (base_script.is_valid()) {
						base_type.script_type = base_script;
					} else {
						base_type.kind = GDScriptParser::DataType::NATIVE;
						base_type.builtin_type = Variant::OBJECT;
						base_type.native_type = scr->get_instance_base_type();
					}
				} else {
					return false;
				}
			} break;
			case GDScriptParser::DataType::NATIVE: {
				if (!ClassDB::class_exists(base_type.native_type)) {
					return false;
				}
				MethodBind *mb = ClassDB::get_method(base_type.native_type, p_method);
				if (mb) {