Sheep eat half as often as they did before 21w39a

Chiseled Bookshelf redstone behavior is inconsistent

Allays, Piglins, and Villagers lose inventory if unloaded and reloaded

Dragon cannot be respawned in an old world

DragonFight data is not completely restored after corruption from MC-103497

Skeleton traps do not spawn as strays in ice biomes

Thrown projectiles go through glass, stairs, and other solid non-opaque blocks

Mobs no longer spawn in blocks with various redstone components

Redstone blocks don't update adjacent blocks' power state correctly

Durability changed on fished junk and treasure since 15w43c

Shields don't block anything if facing straight down

Only some explosions can be blocked: for example, creeper explosions and TNT set by other players is blockable, but TNT ignited by redstone cannot be blocked.

Shield damage direction is incorrect

Overpowered achievement can't be obtained.

Guardians and Elder Guardians no longer rarely drop fish/salmon/clownfish/pufferfish

Endermen no longer drop carried blocks

Horses no longer drop leather/bones/rotten flesh

Killing a sheared sheep still drops wool

Mobs no longer drop equipment

Lily pads can now be placed on ice and frosted ice, but will not stay

Skeletal horses spawned by lightning have unusually high health

Armor durability affecting protection is not working right

Eating a chorus fruit near lava might set the player on fire

Shield blocking oddities

Potions of water breathing, extended fire resistance bugged

Changed brewing recipes

Dragon respawns in old world

Entities duplicate on server when no players are logged in due to fire at the edge of spawn chunks

Tamed mobs follow and teleport to their owner in spectator mode

Not all saplings placed on farmland can grow to trees

Villager inventories can get into a state where villagers cannot do anything useful

Local difficulty has no effect in Easy

Vines no longer spread correctly in corners

Siege zombies spawn inside some blocks

Mob spawner behavior change with respect to SpawnRange

Baby Zombie Pigmen don't forgive, while adults do

Zombified Piglins drop XP and rare drops if killed by anything while in angered state