Honestly, I'm an amateur to this as well. I make games for my friends as a way to joke about our D&D campaign together. But the issue with RPG Maker MZ is that it dislikes serialization (What we do :P).
So I'm going to whip up an alternative way to talk to Linne. If you'd like to join our discord I can get you a playtester role and you can maybe ask around to see if anyone else has this issue? I'm working on getting to the bottom of it. Starting with a backup copy of the Library that you can warp to in case you come across save file compat errors. Linne isn't relevant to progression at all but I spent a really really long time on her dialog and seeing that people wanna meet her makes me happy hahaha.
Again, Sorry for the inconvenience bro. I'm gonna make something work later today!