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I've never set up an afk fish farm, but I know some people have been doing it. If anyone has name tags to spare, could I possibly have some? I think villagers are despawning in my trading hall, maybe when the other random mobs populate their chunks in high numbers. Placing a name tag on most of them should fix this problem. I've already lost a fortune3 librarian.
I can come pick them up if you're in game, or you can leave them in the chest by the start of the rail line to my house, in the nether hub area.