POE2 Trial of Sekhemas Bug

I was doing final boss for Sekhemas trial, and crushing it. Full honour, like 6+ gold keys, solid boons and no detrimental ailments. I offered people free carry and one of the players wanted to try the fight so I said ok and when he died and exited the boss became immune to damage outside of its Energy Shield and it's accuracy skyrocketed. I went from 12K honour to 0 in minutes @10% boss health. If you need I can record the end of my stream where it happened.