To reproduce:

1. Starting with Minecraft 1.16.5, install Fabric loader and Fabric API.
2. Install mobdisguises-1.0.0-fabric and disguiselib-1.0.2-fabric.
3. Create a new world with cheats enabled.
4. Make/find a flat area free of obstructions away from existing villages.
5. Place down a bed.
6. /gamerule doMobSpawning false
7. /summon Villager
8. /time set night
9. Notice that the villager sleeps in a sensible position.
   
10. /disguise @e[type=villager] as pillager
11. Notice that the (disguised) villager is now sleeping in a non-sensible position (rotated and/or positioned incorrectly).
    
12. /disguise @e[type=villager] clear
13. Notice that the (now undisguised) villager is still sleeping in a non-sensible position (rotated and/or positioned incorrectly).
    
14. Wake the villager and let it go to sleep (read: break and replace the bed).
15. Notice that the villager is sleeping in a sensible position again (see step 9's picture).