Villagers not keeping their professions properly

The bug

Villager assign themself to a workstation, but lose interest and reassign themself again rappidly.

 

How to reproduce

1. Place a villager in a holding cell with a workstation
2. Villager assigns himself to the workstation
   [At workhours]
   → [Previously] Villager keeps profession
   → [Now] Villager loses interest and reassigns himself rappidly