Correct, the latest 4.2 doesn't have known bugs with physics disappearing.
What do you mean that physics disappears? Your skeleton is shown without any physics at all? Are the physics you want from moving the GameObject of from animations being played? Are you calling Skeleton updateWorldTransform? If so, make sure you are passing Physics.update. If you are handling time passing yourself, you'll also need to call Skeleton update. If you aren't doing those yourself, you can inspect the spine-unity classes to make sure the expected delta time is being passed to Skeleton update, etc.
