Qt6 QML can't access exposed c++ QObject property of QObject

class ADV_Application : public QObject
{
    Q_OBJECT
    Q_PROPERTY(ADV_Desktop* desktop READ Desktop CONSTANT)
    QML_ELEMENT
    QML_UNCREATABLE("")
public:
    explicit ADV_Application();
    ~ADV_Application();    Q_INVOKABLE ADV_Desktop* getDesktop() const;   
      ADV_Desktop* Desktop() const { return myDesktop; }
    virtual void SetDesktop(ADV_Desktop* theDesktop);
protected:
    ADV_Desktop* myDesktop;
};

class ADV_Desktop : public QObject
{
    Q_OBJECT
    Q_PROPERTY(ADV_Application* applicaton READ Application CONSTANT)
    QML_ELEMENT
    QML_UNCREATABLE("")
public:
    explicit ADV_Desktop();
    ~ADV_Desktop();   
      ADV_Application* Application() const {return myApplication;}
    virtual void BindApplication(ADV_Application* theApplication);
protected:
    ADV_Application* myApplication;
};

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);    
      QQmlApplicationEngine engine;
    const QUrl url(u"qrc:/Main.qml"_qs);
    QObject::connect(&engine, &QQmlApplicationEngine::objectCreationFailed,
        &app, []() { QCoreApplication::exit(-1); },
        Qt::QueuedConnection);    
      ADV_Application* myApplication = new ADV_Application();
    ADV_Desktop* myDesktop = new ADV_Desktop();
    myApplication->SetDesktop(myDesktop);   
      myApplication->setObjectName("MyApplication");
    myDesktop->setObjectName("MyDesktop");    
      engine.rootContext()->setContextProperty("myApplication", myApplication);
     engine.load(url);    
      return app.exec();
}
 
Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")    
onVisibleChanged: {
        console.info(myApplication)
        console.info(myApplication.desktop) // bug here
        console.info(myApplication.objectName)
        console.info(myApplication.desktop.objectName) // bug here
    }
}