I've noticed that most villagers despawn and that if you are able to keep them from despawning (with the use of costly name tags) that most of their trades don't refresh, in vanilla Minecraft villagers are not supposed to despawn on their own and do not run out of trades quickly, last season I was able to make a functioning trading hall that dealed with none of these bugs, is this a new feature or a glitch? Has anyone else ran into this problem?