PBE - Summoner's Rift VU Bug Report

In the lower right corner of the map (where it's all dark, abyssal, and rocky), I noticed that when minions are in the middle of bot lane, the lighting and shadows from the minions show up in a small cave/hole from below the map. I'm not sure if this was intentional, but I thought I'd report this as a bug.

• Also, I believe this can be seen at all times, and that I didn't do anything specific to trigger it. I only noticed it and watched it for a few minutes and kept seeing it happening.