Possible 3.6.8 bug

In my current module I have counters with a front and a back side which I can see flipping the unit via menu or Kb shortcut.
After selecting a whole stack I can see every counter just hovering with the mouse over it. With previous releases I could flip all counters in the stack using the Kb shortcut and, without moving the mouse, see at once the back of all counters in the stack.
It seems that this does non work any more with 3.6.8.
Now I have to move the mouse out of the stack and move it over the stack again in order to see the stack display updated.

Does anyone else has found the same?