Setting ItemSendsScenePositionChanges does not notify GraphicsItemChange::ItemScenePositionHasChanged

Calling

setFlag(QGraphicsItem::ItemSendsScenePositionChanges, true);

will neither cause

qDebug() << "flags: " << flags();

to report that the flag is set, nor getting actual scene position changes notified in the QGraphicsView::itemChange virtual function. The attahced example use a QDeclarative item exposed to QML with this flag set - but without the desired side-effect.