Named villagers are despawning on our realm. We all have safe villager spaces with no way for any mobs to get in (other then players). The spaces are all at max light levels and each villager has its own bed and table that it's connected to. All the villagers are also named. Our named villagers will just disappear from their spaces where there is no way for them to escape. They just despawn at random. Other realms player are also experiencing this. This has not happened to us on our own worlds, so we come to think it is a problem with the way mobs are saved on realms. This problem also happened to our sheep and chicken farms.