Neeko Yuumi UI Bug

So, I was playing some custom games with a few friends, and we noticed a strange bug when Neeko disguised as Yuumi. There were these black bars that stretched across the screen and even across the whole map. They went to baron and we knew where they were because of black bars across our screen as soon as we had vision of them.

Pretty easy to duplicate, Play a game with Neeko and Yuumi, have Neeko disguise as Yuumi, then if that doesn't work, have Yuumi hop onto Neeko disguised as Yuumi.