Map boss disappeared bug repot number 4,411,600,071

i was fighting a map boss, i portal scroll to town to refill flasks i come back and the boss is gone. not dead. just gone.

its the one that looks like its got a large portal shooting out of it and a bunch of monster come running at you, it reminded me of something i run into sometimes it changes the map to like every moster is from another realm for X amount of time you kill them all then it goes back to regular and a reward drops. notsure what league mechanic that is.

but its a boss that kinda does this. i hope that was enough info to help figure out why a boss would go poof!:)

I didn't get credit for it.

No loot dropped and I didn't get the Atlas tree point, this was a map I hadn't completed yet.

The boss had a lot of life when I teleported home, no way it was dead from my actions, maybe bugged out and died.