Hi! I made a pretty effective iron farm during my time playing Bedrock Beta in the 1.16 betas. I left the beta to start a realm when 1.16 started. Before converting the world to a realm, I ran through and tested various farms I made in Beta, including this iron farm, to see if they still worked (they all worked). I converted the world to a realm two days ago 6/25/20, and the farm broke. No change in set up, the farm follows the new spawn rules highlighted in the changelog. I did some resetting and it worked, but as soon as I unload the chunk the villagers seem to break and golems no longer spawn. I've repeated the process several times. On a backup, it seemed to work fine. 

Today, I fully rebuilt and brought new villagers into the farm. The farm once again worked flawlessly, so I went AFK for two hours and had normal returns on iron. I came back and unloaded the chunks to work on a new project and when I came back, the village broke again. I am sure others may have reported similar bugs, I am not sure if it is Iron Golem spawning issues or village issues, but the design works and seems to be bugged, Thanks!