Ekko W Bug

I'm unsure if this is a bug with Garen, or Ekko's W. I was playing Garen at the time and I tower dove an Ekko who stunned me using his W and being within the circle area. I had tower aggro, and when I was stunned, my champion went completely invisible and the tower ignored my presence entirely and targeted minions instead. This was a regular occurrence throughout the game, however this is just an example.