Zalmarath turns invincible

Hey,

happened to my warrior 1x in both normal and cruel respectively: Zalmarath turned invincible during the fight (at ca. 1/3 life). In both situations, he could not be damaged anymore after changing position to the right hand side. This holds true for melee attacks and ranged/AoE damage (e.g., totems, slams). The boss did not get out of this state even after changing position again, so that you had to restart the fight.

Happened just now and < 7 days back, so likely was already an issue before the current version.

Thank you for looking into it!