When a QGraphicsProxyWidget has ItemIgnoresTransformations set then it does not update the widgets inside it correct with regards to blinking cursors

When a QGraphicsProxyWidget has ItemIgnoresTransformations set then it does not update the widgets inside it correct with regards to blinking cursors. If there is more than one spinbox inside the widget contained by the QGraphicsProxyWidget, then clicking from one to the other will show the cursor blinking in all of them rather than just one of them.

What also seems to be related is the fact that you cannot edit in the spinboxes either with the keyboard, so the focus appears to be faked and not real at all.

Example attached reproduces this problem.