I was strolling around a local mall today when the game glitched the display of my trainer, flashing between normal size and giant. It also really messed up the rendering of the Arcanine that was a nearby gym defender. I was still able to spin pokestops and catch pokemon. But I did not test gym attacks, and there were no raids in the mall to test raiding for the couple of hours I was there. Here are a few screen shots I managed to get during the episode.
Things went back to normal after I restarted the game later.