Teemo Bug

The other day, I landed a stun on an enemy Teemo. I can't remember who exactly I was playing, but I do know it was a stun (not a snare). In the middle of the stun, he randomly went invisible. His passive didn't register the CC as a stun, but instead as him voluntarily standing still. This actually ended up saving his life, as he avoided auto attacks and had time to flash a wall and escape. I feel like this has something to do with the new bush mechanic. I can reproduce this if necessary, but it's pretty straightforward. Actually, I am fairly certain I got it on video anyway.