I am almost done making my Minecraft adventure map. I spawned villagers using command blocks and I made them: PersistenceRequired:1 so they wouldn't despawn. They don't. But when I duplicate the world, they despawn. I've nametagged them, and nothing has worked so far. It would be great to see some solutions. Thanks!
Villagers are specifically coded in Minecraft to never despawn. They can still die, they can still wander off never to be seen again, and various bugs can even teleport them around to different parts of the world (not to mention replace the chunk info they were a part of).