Villagers disappear when sleeping in bed that has solid blocks above the bed.

To recreate this bug:

1. First, the villagers must be sleeping.
2. There must be solid blocks above the villager. (Specifically 2 blocks above the bed starting at feet level)
3. There should be no blocks below the bed.
4. Log off the game and when you log in again, the villagers are now gone.

The exception of this bug is only the baby villagers. They won't be removed and I'm guessing it's because they have small hitbox compared to regular size villagers.