Monster HP Bug

I found two bugs where the beast's HP disappears and I can't kill it, one was a map boss and the other an elite. On the map boss, after several minutes I discovered that I could push him using the ice wall and I managed to make him return to normal, but in the case of the elite I simply left and couldn't finish the map, since the only monster left to finish the map was precisely him.

Elite video: https://youtu.be/bGyWJu4vtow

Boss map video (02:25): https://youtu.be/nMkC_BbZZ2U