Zalmarath persistent beam attack after death

Bug Report ID: #3002680689

I killed Zalmarath as he began channeling the eye beam attack that spirals out from the center of the arena. After dying, his attack continued to spawn more and more beams and projectiles that infinitely stacked with each other, continuing to deal damage. Screenshot taken a minute or two after the kill with all the effects attempting to blow up my computer. Note the attack is still originating from where his model is moved after his death animation.

This actually happened to me as well after got the boss defeated. I was playing with a friend. I died to that death bug and my friend survived but had to teleport back to town which didn't work. Stuck on loading screen. Well, he restarted the game but couldn't get back into game. Had to wait some time before the instance reset and was able to log in. It seems he was unable to log into that room as the bug was present there.