Fisherman Fizz bot walks through Anivia wall[gameplay]

While playing a coop vs ai intermediate, twice I set up anivia's wall and fisherman fizz walked right through it. Not pogoing over it, but just walking through as he tried to escape. Tested it on mundo and lux and did not happen with them. Multiple players on my team witnessed this. I know fizz is supposed avoid unit collisions, but that shouldn't include immovable objects such as this.