Minecraft wiki entry for Development_versions, associated text: MC-1126 – Server command "/whitelist list" doesn't display the full list of players.
MC-1202 – Mobs spawn and then quickly despawn in peaceful. Looks like the "ender-porting-out-of-water" effect.
MC-2097 – Players can't get "The End?" achievement.
MC-2419 – Persistence required tag freezes mobs.
MC-2692 – Hard to spawn squids.
MC-15732 – Achievement "We Need to Go Deeper" rewarded for going through an end portal.