reimplementing QGraphicsObject.itemChange causes problems

Reimplementing QGraphicsObject.itemChange in pyside seems to cause a few strange issues for me, even if the new method does nothing more than call the original method and return its value. Example script attached; shows that setParentItem() seems to do nothing if called on an object with reimplemented itemChange() method. It works as expected when running with PyQt4.

I have pyside 1.1.0-1 installed from the Ubuntu 12.04 repository.