This was the post @LittleBrownBiscuit mentioned an it also came to my mind right away when reading this new topic: Zoi got married, spouse now NPC (DON’T MERGE PLEASE!)
@LennyOgg Did you ever come across the “spouse becomes NPC” bug in your save file? I really thought the disappearing ocea issue was somehow connected to Zois incorrectly becoming NPCs but I think I was wrong 