QPainterPath::intersects is broken

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

    QGraphicsView view;
    QGraphicsScene *scene = new QGraphicsScene;
    view.setScene(scene);
    view.setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    view.setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

    QPainterPath p;
    p.addRoundedRect(-10, 10, 40, 40, 10, 10);
    QRectF r(0, 0, 100, 100);
    scene->addRect(r);
    scene->addPath(p);
    qDebug() << p.intersects(r); // false, should be true

    view.show();

    return app.exec();
}