Bug Zelina and Zolin

Hello, I have a major problem with the last interlude. The boss Zelina and Zolin are bugged; the boss mechanics no longer trigger, and I can't access the world map. Therefore, there's no endgame for my character. Could you please tell me how to fix this?
Thank you in advance!

I have a similar bug: the boss fight is not triggering for me. I was able to approach the fight multiple times. But then I died after only defeating one of the two... and after respawning I can't trigger the bossfight.