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You can hit mobs through doors!

Spawner Flame Remaining

block changeing from normal stone to silver fish stone

Tool Highlight shows when itemstack changes

Golem attacking nothing

Mob pathing updates on a delay

Deep water = Mobs forget AI

Player spawnpoint used in monster spawning seems to be unaffected by sleeping in bed or /spawnpoint command

Raining Zombies - MonsterSpawner spawns zombies in the sky

Monsters Spawning in lighted areas.

The mob is disappearing

Monsters can be added to teams, but are not affected by teamrules

Mining any type of stone monster egg with silk touch doesn't spawn a silverfish

Wolves hurt during fight do not sit down again after fight

Monsters spawn at daytime at y=256 and don't burn

Village structure is missing torches

Iron golem / VillagerGolem killing monster it is riding has broken AI

Spawner spawns entities with NBT tags and monster with no Pos tag at wrong position

Spawners are not spawning monsters anymore

World generation spawns too many monsters at the same place

Endermen don't often teleport instantly when they fall into water

Some mobs do not spawn in river biomes