Act 9 Shakari Unkillable

When I was attempting to get my passive point from act 9 Shakari, the boss would repeatedly become undamageable in the last third of her HP

I tried:
-Changing regions (Canada -> Washington)
-Doing direct damage from a skill (I use corpse explosions for damage)
-Remaking instance
-Waiting to do damage
-Doing damage as fast as possible

None of these worked until I had someone else enter the area and kill it for me with me not in the zone and with all skills disabled

Bug report reference number is 1,109,975,793

IYellThenYouExplode is my character since it might be worth investigating specific skill interactions with the bug