Every armor stand in my pure Survival world that contained a set of armor, either gold, iron, enchanted or netherrite vanished from the world following the 1.17.40 update today (10/19/2021). This was a painful loss!!!!!! 

I also had a full 20 villager iron farm with traded villagers who had access to their beds and workstations. 10 of them immediately vanished following the update and splash screen to 1.17.40 update today. 

I also had a nametagged parrot. The parrot despawned following the 1.17.40 update today.