QWebEngineView in QGraphicsProxyWidget in QGraphicsScene hangs on exit

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    mScene = new QGraphicsScene(ui->graphicsView);
    ui->graphicsView->setScene(mScene);

    mWidget = new QGraphicsProxyWidget();
    mScene->addItem(mWidget);

    m_webEngine = new QWebEngineView();
    mWidget->setWidget(m_webEngine);
}

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    mScene = new QGraphicsScene();
    ui->graphicsView->setScene(mScene);

    mWidget = new QGraphicsProxyWidget();
    mScene->addItem(mWidget);

    QQuickWidget *quickWidget = new QQuickWidget();
    quickWidget->setResizeMode(QQuickWidget::SizeRootObjectToView);
    quickWidget->setSource(QUrl("qrc:/qml/main.qml"));
    mWidget->setWidget(quickWidget);
}