Dragging an Item from the item library into back or front from a Flipable does crash

Dragging an Item from the item library into back or front from a Flipable does crash.

1) Create a Flipable
2) Drag an Item from the item library to front or back from the Flipable
3) Accept the warning

crash

Reparenting the Item in the navigator to front/back after it was dropped once elsewhere, does work.