Thank you so much! But nothing worked. No one of this ways. Problem was fixed by opening in CC 2020 (it was huge luck) and sequentially saving every of important compositions separately. So we found the crushed one, deleted it and saved it for CC 2019 (this is the version where the final project is being edited, don’t ask)). By the way, opening in CC 2020 and saving for other versions without changing also doesn’t work.
Anyway thanks a lot, now I know new was to fix next projects!