Evan Purchell
Comments
I can confirm this. I employed snow golems to speed up Silent's guardian farm in afk mode since the guardians get stuck trying to swim in the flowing water only to be heartbroken when the snow golems just stopped caring that there are hostile mobs in front of them. It is inconsistent as well since sometimes they will throw snowballs and sometimes they just sit there and don't care. I added a couple screenshots.
This is absolutely a thing. I have reproduced this several times after my villager based farms were finished. Carrots work fine. Potato farmers do not. They will only share if I manually give them potatoes by throwing them to the villager or breaking the crops leaving potatoes on the ground for them to pick up. Then the farmer will even replant the potatoes. It seems once his inventory reaches a certain level he looses interest in farming more but will not share to a hungry villager.
I don't know about the changing jobs issue as I have not experienced this. However, you may be experiencing the same bug as the one I submitted. MCPE-46064
This would explain the missing villagers.
I modified my trading hall by making all of the villager pods with the beds in them 3 blocks tall. They all stopped dying after I did that. This confirms the issue is related to them being inside of a 2 block tall space with a bed.