Missing boss HP bar and statues after Vessel of Kulemak fight

I encountered a bug during the fight with the boss Vessel of Kulemak.

After my first death in the fight, the boss’s HP bar disappeared completely.

When I killed the boss, the visual buttons on the statues used for empowering him disappeared, and I could not use them anymore.

Edit to add image:
https://drive.google.com/file/d/11XkON27BLzUzyDJlJhVa8VTs81d5TrHx/view?usp=drive_link

I've had the same problem, and after trying it several times, it seems that the only solution is to complete all the phases without dying the first time.

I had this bug as well. In addition, it was invisible for some of the previous phases.

same thing here, had to go to charchater menue to get out of the boss fight. not sure if this is a bug or a mecanic?