Ok, so I reached the point where i have to lift the Lantern King's curse, everything works fine (no curse stacking or similar problems i've read about), but when I go to Shrine of Lamashtu, Tsanna is not there. I fight the hydra and the owlbears, kill them, and nothing happens. Tried going back to camp and talking to everyone, looking elsewhere for Tsanna, but i cant progress any further since Storyteller tells me that curse is still upon me. As far as I recall, i used the Lawful Good action when i dealt with her in the lodge (told Kesten to arrest her, let everyone else go, and allow the ritual on that pregnant woman). Searched everywhere for this, so far found only one topic on steam forums - the guy has the same problem but nobody responded to his post, any help would be appreciated since i sunk numerous hours in the game and i cant finish it at the very end :(

According to this guide and my own experience, the only areas whose completion lessens the effects of the curse are Oleg's, Varnhold, Flintrock Grassland, and Pitax. The other areas are optional and have no effect other than recruiting more allies to your cause so far as I am aware.

Tsanna did not reappear for me either, also walking a LG path, and I was able to finish the game just fine.

If you are unable to travel anywhere else, then you should use the internal bug reporting feature (default key binding is F11). It's also not clear from your post if you're using any mods, so if you are, be sure to specify those in your report if you take that route.

Thanks for the reply, reported the bug. Playing without any mods, I also noticed that Shrine of Lamashtu isn't even mentioned in the journal, while Troll Lair (the other optional place in my playthrough) is. Went through the whole thing several times (did a hard save at the House at the end of time), paid attention that the journal updates after each of the cruical areas and it did. It updated also when i went for Bartholomew in the lair, but nothing happens at the Shrine. Still the Storyteller says the curse is upon me and i can't advance the plot.