Object silhouette displayed when using QtSceneLoader and Qt3D rendertree

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);    createSceen();    setWindowTitle("Load scene transparent");
}MainWindow::~MainWindow()
{
    delete ui;
}
void MainWindow::createSceen()
{
    // Create a view and attach to widget
    m_view = new Qt3DExtras::Qt3DWindow();
    QWidget *viewContainer = QWidget::createWindowContainer(m_view);
    setCentralWidget(viewContainer);    // The root entity for the new sceen
    m_rootEntity = new Qt3DCore::QEntity();    // Create a splitt rendertree
    m_transparentLayer = new Qt3DRender::QLayer;
    m_opaqueLayer = new Qt3DRender::QLayer;
    Qt3DRender::QRenderSurfaceSelector *renderSurfaceSelector = new Qt3DRender::QRenderSurfaceSelector();
    renderSurfaceSelector->setSurface(m_view);
    Qt3DRender::QClearBuffers *clearBuffers = new Qt3DRender::QClearBuffers(renderSurfaceSelector);
    clearBuffers->setBuffers(Qt3DRender::QClearBuffers::AllBuffers);
    clearBuffers->setClearColor(Qt::white);    Qt3DRender::QViewport *viewport = new Qt3DRender::QViewport(renderSurfaceSelector);
    Qt3DRender::QCameraSelector *cameraSelector = new Qt3DRender::QCameraSelector(viewport);
    m_camera = new Qt3DRender::QCamera(cameraSelector);
    m_camera->lens()->setPerspectiveProjection(45.0f, 16.0f/9.0f, 0.1f, 1000.0f);
    m_camera->setPosition(QVector3D(-20.0f, 20.0f, 0.0f));
    m_camera->setUpVector(QVector3D(0,1,0));
    m_camera->setViewCenter(QVector3D(0, 0, 0));    cameraSelector->setCamera(m_camera);
    // not entirely sure why transparent filter has to go first
    // I would have expected the reversed order of the filters but this works...    Qt3DRender::QLayerFilter *transparentFilter = new Qt3DRender::QLayerFilter(m_camera);
    transparentFilter->addLayer(m_transparentLayer);    Qt3DRender::QLayerFilter *opaqueFilter = new Qt3DRender::QLayerFilter(m_camera);
    opaqueFilter->addLayer(m_opaqueLayer);    m_view->setActiveFrameGraph(renderSurfaceSelector);    m_opaqueLayer->setRecursive(true);
    m_transparentLayer->setRecursive(true);    m_view->setRootEntity(m_rootEntity);    Qt3DExtras::QFirstPersonCameraController *camController = new Qt3DExtras::QFirstPersonCameraController(m_rootEntity);
    camController->setLinearSpeed( 50.0f );
    camController->setLookSpeed( 180.0f );
    camController->setCamera(m_camera);    // Create a few basic geometries that works...    // Create a Cone Shape
    Qt3DExtras::QConeMesh *cone = new Qt3DExtras::QConeMesh();
    cone->setTopRadius(0.5);
    cone->setBottomRadius(1);
    cone->setLength(3);
    cone->setRings(50);
    cone->setSlices(20);    // ConeMesh Transform
    Qt3DCore::QTransform *coneTransform = new Qt3DCore::QTransform();
    coneTransform->setScale(1.5f);
    coneTransform->setRotation(QQuaternion::fromAxisAndAngle(QVector3D(1.0f, 0.0f, 0.0f), 45.0f));
    coneTransform->setTranslation(QVector3D(0.0f, 4.0f, -1.5));    // Cone material
    Qt3DExtras::QPhongMaterial *coneMaterial = new Qt3DExtras::QPhongMaterial();
    coneMaterial->setDiffuse(QColor(QRgb(0x928327)));    // Cone
    Qt3DCore::QEntity * coneEntity = new Qt3DCore::QEntity(m_rootEntity);
    coneEntity->addComponent(cone);
    coneEntity->addComponent(coneMaterial);
    coneEntity->addComponent(coneTransform);
    coneEntity->addComponent(m_opaqueLayer);
    // Create a Cylinder shape
    Qt3DExtras::QCylinderMesh *cylinder = new Qt3DExtras::QCylinderMesh();
    cylinder->setRadius(1);
    cylinder->setLength(3);
    cylinder->setRings(100);
    cylinder->setSlices(20);    // CylinderMesh Transform
    Qt3DCore::QTransform *cylinderTransform = new Qt3DCore::QTransform();
    cylinderTransform->setScale(1.5f);
    cylinderTransform->setRotation(QQuaternion::fromAxisAndAngle(QVector3D(1.0f, 0.0f, 0.0f), 45.0f));
    cylinderTransform->setTranslation(QVector3D(-5.0f, 4.0f, -1.5));    // Cylinder material
    Qt3DExtras::QPhongAlphaMaterial *cylinderMaterial = new Qt3DExtras::QPhongAlphaMaterial();
    cylinderMaterial->setDiffuse(QColor(QRgb(0x928327)));
    cylinderMaterial->setAlpha(0.5f);    // Cylinder
    Qt3DCore::QEntity * cylinderEntity = new Qt3DCore::QEntity(m_rootEntity);
    cylinderEntity->addComponent(cylinder);
    cylinderEntity->addComponent(cylinderMaterial);
    cylinderEntity->addComponent(cylinderTransform);
    cylinderEntity->addComponent(m_transparentLayer);    // Now create a object using the scene loader...
    // NOT WORKING? This cause an black area to be displayed inn front of the scene :(
    Qt3DCore::QEntity * objectEntity = loadFromFile(QUrl("qrc:/models/object-1.qgltf"));
    objectEntity->addComponent(m_transparentLayer);
}Qt3DCore::QEntity *MainWindow::loadFromFile(const QUrl & url)
{
    qDebug() << "Load from file: " << url;    Qt3DCore::QEntity *sceneLoaderEntity = new Qt3DCore::QEntity(m_rootEntity);
    Qt3DRender::QSceneLoader *sceneLoader = new Qt3DRender::QSceneLoader(sceneLoaderEntity);    sceneLoaderEntity->addComponent(sceneLoader);
    sceneLoader->setSource(url);    return sceneLoaderEntity;
}