So there I was, celebrating that I successfully got a zombie villager in a 2 by 2 by 2 whole that he couldn't get out of. I put a nametag on the zombie villager just incase he wouldn't despawn. Once I cured him with a golden apple and weakness potion, I stayed near him as he was changing to a normal villager. After he switched to a villager, I put him inside my house where there was full light everywhere. I went to do a little farming and when I came back he was missing and nowhere to be found.