Repeatable bug: Game freezes when victory or defeat is somewhat imminent

Couldn't move to attack when polymorphed and victory was imminent. Seems like a bug that when not hard cc'd you can't autoattack because the end of game screen is too close and that is a semi-complete freeze all (auto attacks especially). I could have at least move or turned to attack but I was stuck frozen. I had about 2 seconds of time which I was unable to do anything even move or turn around. I've seen this multiple times before as the end of game screen is really buggy. Sometimes it happens even when the game continues because an inhibitor responds. The game is not over until the nexus is destroyed. Don't prematurely block champions because your machines stink at processing. let the game play out.