Qt::WA_QuitOnClose has no effect if QQuickWigdet is a child of QWidget

#include <QWidget>
#include <QApplication>
#include <QQuickWidget>

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);

	QWidget w;
	w.setWindowTitle("Close This");
	w.show();

	QWidget w2;
//	new QQuickWidget(&w2);   <--------- uncomment this to have the wrong behavior
	w2.setAttribute(Qt::WA_QuitOnClose, false);
	w2.setWindowTitle("This should be closed automatically");
	w2.show();

	return a.exec();
}