View of block disappears at edge of chunk.

What I expected to happen was...:
Blocks would stay visible, not get a view of moon/sun

What actually happened was...:
last chunk disappears.

Steps to Reproduce:
Set view angle to maximum (quake pro).
Set render distance to 8 blocks.
Dig a tunnel 2 blocks high. remove one higher block from the side at the edge of a chunk (as in screenshot).