When I trade with the Cartographer, he processes the trade as normal. However, when I exit the trade menu, the game "freezes" per say. I can walk around, open doors, open my inv and pause the game - but it doesn't let me interact with my chests, crafting stations, or anything else. And when I go to quit to main menu, it freezes on the saving world screen for about 5 minutes before crashing my game all together.

I would like to note that in each instance of this occurring, it was only when I leveled up the cartographer specifically. The villager processed that he leveled up, but it was after that when these issues started occurring and his level up particles infinitely stayed.

(edit) After the game crashed on the "saving world" screen, it actually did save as normal. And everything went back like nothing happened until i leveled the cartographer up again.