I have a very weird problem with the game. I was at Okriana, found Marion after speaking to the local Shamaz. The Shamaz already told me that I can't enter the Palace Fae yet, I have to wait for him to be called and that he will notify me if that happens.

After some wandering in Talanzaar I returned to him and a strange bug appeared: the Shamaz is stuck in his building near the ceiling and there's no way I could talk to him. Do I need to talk to him again or I can just enter the palace later without doing that? Is this gamebreaking?

Not gamebreaking. It's safe to keep playing. But it might be annoying not to be able to ask the Shamaz for healing. Out of curiosity, if you leave Okrianna, like you go back to Shamazaar for example, and then come back to Okrianna, does it fix the problem? I would think it would re-load everything so hopefully he'd no longer be stuck.

I tried everything and sadly nothing is reloaded. :( I'm happy that I can finish the game at least, healing is not that much of a problem because I collected a huge amount of medkits.