I don't believe that this is working as intended, as once the villagers stop farming they will never start farming again, and there's no way to make them farm.
Upon further testing, I have found that villagers now have 8 stacks worth of inventory space. When a villager's inventory is completely filled with wheat, they will not harvest any crops. This seems to be the cause of the issue, I hope this helped 🙂
This issue was categorized as a duplicate of another issue where pre-snapshot villagers do not harvest crops. This is incorrect as the villagers I used were spawned in after updating to the new snapshot.
Yes, once a villager's inventory fills with wheat they are never able to farm again.