In the middle of making a very large villager trading hall, and I am currently running into an issue of villagers no longer accepting replacement job blocks.

The process I'm using is as follows:

1. Breed a new villager
2. Send them 15+ chunks away by rail to a location with no other job blocks
3. Provide a bed and a job block (screenshot example would have been a composter)
4. Lock them into that job via a trade
5. Send them back to the original village where they were bred, turn them into zombies, and cure them
6. Send them to their cubicle, provide a bed, and a replacement job block.

Once there, the bed is accepted as a POI for that villager, and they will sleep in this bed. However, the job block is never accepted. I have verified that the NBT data does not include any job block registered to these villager already, using a 3rd party tool. I also notice that if I leave myself AFK next to the villager for 3+ hours, they will eventually accept the block. If I had to guess, the routine to select a new job block at all is not happening for some reason.

This village has 58 villagers currently, and other users on this realm have complained of similar issues with getting villagers to assign themselves to job blocks in other villages.