When a villager/player is standing up next to two perpendicular walls with the corner blocks missing, zombies can attack though the corner of the wall.

What I expected to happen was the zombie not to be able to attack, as there was no gap in the wall, just two walls meeting diagonally.

What actually happened was the zombie was able to attack the villager that was up against the wall, killing it. This also happens with baby zombies

Steps to Reproduce:
1. Build 2 walls perpendicular to each other, meeting up.
2. Remove the outside corner blocks.
3. Spawn zombies outside the wall.
4. Use water to push a villager up against the corner.