What I expected to happen was...:
When in render distance 4 or 5 chunks, the sky in the End should be completely purple, or alternatively, should have fog like with 2 or 3 chunks.

What actually happened was...:
It seems like the sky is not rendering in corners of the world, creating these black triangles that can be seen most clearly on the diagonals. This is worse when the render distance is 4, although it is noticeable on 5 as well.

Steps to Reproduce:
1. Travel to the End
2. Change render distance to either 4 or 5 chunks
3. Move around your camera, you will notice the sky is glitched.