Immortal mobs

Welcome

Today i enter to Venom crypts in act 6 i kill all mobs and... SUPRISE. One of them is immortal.

Its not fitst time i meet immortal mobs. I dont remeber when but in sct 3 or 6 i kill all mobs and minions are still spawning.

Since I am unable to document the earlier issue with the minions, I am attaching a screenshot of today's event.





EDIT: I will only add that the mouse cursor, which unfortunately is not visible, is pointed at the immortal mob