You can hit mobs trough corners, like this:
(O = block, M= Mob, P = Where player can hit it)
MO
OP
The Walls of course need to be 2 blocks tall.
You can see the mobs hand, allowing you to hit it.
Linked issues
duplicates 1
Comments 6
Check my report, it has the hit-box images included now. https://bugs.mojang.com/browse/MC-50668
Please attach screenshots without and with the hitbox display (F3 + B)