QQuickWidget doesn't handle reparenting properly (e.g. QDockWidget)

#include <QQuickWidget>
#include <QtWidgets>

int main(int argc, char **argv)
{
    QApplication app(argc, argv);
    QMainWindow *toplevel = new QMainWindow;

    QDockWidget *lcdDock = new QDockWidget;
    QLCDNumber *lcd = new QLCDNumber;
    lcd->display(1337);
    lcd->setMinimumSize(250,100);
    lcdDock->setWidget(lcd);
    toplevel->addDockWidget(Qt::BottomDockWidgetArea, lcdDock);

    QUrl source("qrc:quickwidget/rotatingsquare.qml");

    QDockWidget *quickDock = new QDockWidget;
    QQuickWidget *w = new QQuickWidget;
    w->resize(300,300);
    w->setResizeMode(QQuickWidget::SizeRootObjectToView );
    w->setSource(source);
    quickDock->setWidget(w);
    toplevel->addDockWidget(Qt::BottomDockWidgetArea, quickDock);

    toplevel->show();

    return app.exec();
}