Kai'sa glitch into the ground?
This probably isn't important, but when playing a PBE game on ARURF I encountered a bug. My champion model [Kai'sa bullet angel no chroma] bugged into the ground so that only her head was showing. When i asked my teammates they said i looked normal but my champion was clearly inside the ground. My teammate graves was also inside the ground but only from my perspective.. weird, no other champions were after that. I don't know if it was game play affecting because it happened near the end of the game after i had respawned. I also downloaded the replay, and saw exactly what i experiences. Shortly later i replayed it to try and highlight the part with the bug, and it wasn't there anymore, my champion model was completely normal. idk if this bug has been reported or not already, but i thought i'd give my case of it 
Also noted, that when trying to view and record this bug, it seems to fix itself even within the same replay. Definitely client side but weird nonetheless