Ytzala, Blood Oralce. POE 2

Hi.
Please fix the boss Ytzala, Blood Oralce in the late game
Something impossible happens with it.
I'm playing Witch -> Lich with minions 90 lvl and I can't kill it. I damaged it more than 20 000 000 damage, but.... It always recovers its life from my minions. That's a crazy situation.
I fought with it for more than 30 minutes, and I can't kill it, and it can't kill me. And I can't leave the map without dying. After reloading the game, I still fight with it.
Imbalance and incredible situation..