Player mastery, books, and monster slayer goals all reset
Multiplayer game on PC, no mods. It would appear that a lot of pieces of the game sort of reset in this game for one player. We started it after 1.6, my parents (butterfly and bee) play couch co-op on one computer and I (ladybug) join online on another. I had entered the mastery room and gotten my first two levels (combat and foraging), then one day when I entered the mines, my health was back to 100hp. We restarted the computers and the game and my health was back to normal, but my trinket slot was gone (frog still follows me around though). My xp needed to reach a level of mastery was reset to 10,000, and when I entered the room, everything was available to claim again. I still was able to craft all the items I had unlocked, but have not found any trinkets or golden mystery boxes. Then I noticed I didn't have a thumbs up on a book I'd definitely read, checked my books, and they were all blank. Then a couple in-game days later, I checked my monster slayer goals and they had all been reset. It seems that fishing, shipping, secret notes, etc have all stayed the same. My hearts with npcs never disappeared. I ended up getting the 10,000 xp and claiming mining mastery. I'm sure too much time has passed to fix anything. There were no error logs in the folder, I can't upload the save file as it's too large.