Memory Leak when QQuickItem created by QQmlComponent in C++

Hi, 

I tried to create and delete QQuickItem from C++.  but I found there is memory leak when  I call QuickItem deleteLater function.

You can check the simple attachment.

here is simple code show create quickitem in C++: 

 QQmlComponent component(m_pQMLEngine, "qrc:/Test.qml", this);
    if(component.isReady()) {
       m_tmpItem = qobject_cast<QQuickItem*>(component.create(m_pQMLContext));
        m_tmpItem->setParentItem(m_pMainRootItem);
        m_tmpItem->setX(100);

        // QQmlApplicationEngine::setObjectOwnership(m_tmpItem, QQmlApplicationEngine::JavaScriptOwnership);
        QQmlApplicationEngine::setObjectOwnership(m_tmpItem, QQmlApplicationEngine::CppOwnership);
        QObject::connect(m_tmpItem, &QObject::destroyed, [&]()

{             qDebug()<<"destroyed!!!!!";         }

);
    } else

{         qCritical()<<"create EffectPage failed"<<component.errors();     }