Graphics corruption with transparent QQmlWidget on QGraphicsProxyWidget

    auto obj = new QGraphicsProxyWidget(this); // 'this' is a QGraphicsItem 
    obj->setAutoFillBackground(false);

    auto widg = new QQuickWidget;
    widg->setStyleSheet("background-color: rgba(0,0,0,0)");
    widg->setAutoFillBackground(false);
    widg->setSource(QUrl("qrc:/DummyProcess.qml"));
    widg->setClearColor(Qt::transparent);
    widg->setAttribute(Qt::WA_TranslucentBackground, true);
    widg->show();

    obj->setWidget(widg);

import QtQuick 2.3

Item {
    id: root
    width: 200
    height: 100

    Text {
        text: 'toto'
        color: "yellow"
    }
}