Villagers, when name tagged and then subsequently are converted into Zombie Villagers retain their name tag but can despawn.

Potion effects are lost when exiting the end dimension

Novice Villagers wont change profession if a new workstation is available, as they do in Bedrock edition

EnderDragon will land very rarely during Fight, often flying in circles, and regenerates to full health and teleports somewhere above the portal when relogging.

hs_pid_error appears for no reason in snapshots.