Save file doesn't work on dedicated server
I'm self-hosting dedicated server of Valheim on my home server with Ubuntu 24.04.4 LTS using lloesche docker image. Me and my friends went through all biomes until Ashlands and left the game for a couple of months because we burnt out farming 2 star Asksvin. Recently we returned and found out that our world is broken (seems to be the wrong seed and no progress on the map research) although the save is not corrupted. Transferring the save file to my gaming PC with Windows 11 and loading to the world locally worked flawlessly yet it doesn't work on server - I've already tried saving it locally on Windows 11 and moving the save file back to home server, reinstalling dedicated server, rebooting etc.
Have anyone encountered that issue? If so, how do I fix it?