No experience with Co-Op but according to this one solution was for the host to recreate their character, another was related to a mod called Shani’s Stuff
Hi, I playing with Wife Co-Op mode too and we encountered same problem. We playing with some mods and Yesterday night before my logoff i saw her character - she hosting the game. And today we started as usual and she invited me via friend list and BAM i can’t see her character.
We fixed it just by loaded backup save from yesterday. All is working but everything from today is lost.
What i discovered is that save file from night have about 1,5MB and corrupted saves where i stopped to see her hav…