I was in a nether fortress in a very wide area and a wither skeleton chased me. I went to a wall and built a cobblestone cage around me to protect myself. But the wither skeleton somehow was able to hit me through the corners of the structure. This is not supposed to happen. Let alone the wither skeleton shouldn’t of been able to see me inside the cobblestone structure and therefore should’ve walked away.

What I expected to happen was...:
When I built the cobblestone cage. The wither skeleton won’t be able to hit me through the wall.

What actually happened was...:
The wither skeleton attacked me through the corner of the cage and killed me.

Steps to Reproduce:

1. Find a wither skeleton.
2. With the wither skeleton chasing you, run to a wall.
3. Build a cobblestone cage around you.
4. The wither skeleton will het you through the corners and kill you.