The Testworld was created in the previous snapshot and a villager trading center was put up to test effects during snapshot changes. It is a survival world with the seed: -5821137628617365213

Villagers with different professions where put in a straight line, their workstations where put on Magma blocks. Normal behaviour would still be, that the would refresh during the daily tick updates.

Current situation:

Villagers that had a profession previously assigned and have the POI workstation in their brain will never again try to find a new OR old workstation and thus remain in their state forever. Last worked just ticks up and thats it.  

Attached is a comparison between the two /GET data entity commands of "old villager" on the left and newly created farmer on the right