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Zombies only fight back against players

Wrong attack radius calculation damages/kills entities through blocks and corners

Mobs can attack through plate glass

Wolves have big difficulties attacking large Slimes and Magma Cubes and Horses

Village spawned iron golem problem

Melee damage with zombies

Attacking an unsaddled pig while holding a saddle saddles the pig

Skeletons will come close to attacker

Zombie Pigmen don't attack in groups when fighting other mobs

If you attack another player and you have a dog, the dog will growl forever and give no damage

Some Mobs don't see you when it's day and their in the water

Hostile Endermen reset to being neutral after killing another mob

Deep water = Mobs forget AI

Mobs no longer attack other mobs

Sitting tamed wolves growl when attacking nearby mobs

Tamed wolves don't attack horses

Mobs don't exist

Entities can't attack the player when they are falling

Hostile wolves beg for bones when in the air

Withers will not pursue players in survival mode unless attacked

Mob hit box is different between survival and creative

Spectator Mode Remaining in Mob and "Attempting to attack an invalid entity"

Player can hit behind, through walls and other angle

Wolves hurt during fight do not sit down again after fight

Guardian doesn't attack Players

When invisible, endermen can see you when you stare at them

Damages and burning color strangely affect skin, armor and worn items

Debug menu doesn't render as expected/Attack Strength Indicator not present in F3 (only when set to Crosshair)