Villagers disappearing/despawning.

Villagers seem to be disappearing without a trace in the new update.

I had two separate villager pens with several hundred villagers and a separate one with just Librarians. Encased in glass with no exits. They seem to have vanished without a trace. I moved ten of them into yet another pen, a single block with just a piece of glass above them.

Those are all gone as well after checking it.

No raids have occurred in any of these places.