Mobs are hell bent on trying to jump over 1 1/2 blocks.. they literally go straight to the block ignoring everything else and always try to jump over it.. this gets my villagers killed by skeletons of and the crops stomped. Villagers change professions even after they’re fully established at the highest rank, you need to do away with this entirely, (they’re only supposed to change professions if you haven’t traded with them at all AND there’s no work block for them to use.. it has to be both.) This is a needless change and I can only see people being frustrated with losing their best villagers to another profession.. It just happened to me after spending hours to get both villagers to their highest level..