Mobs' Hitbox disregards Blocks

Hitbox of mobs does not take surrounding blocks into account(both opaque and transparent blocks).
Mobs can be hit through the corners of walls (walls without corner blocks but still enclosing an area).
Mobs also take damage from Hostile mobs in same manner.
Example: Villagers can be hit through the corner by player(me with a sword in attached images).
Villagers take damage from zombies through corners as well(shown in attached images).