Trundle Sheen proc

I just played a game as Trundle in Twisted Treeline, and I was amazed when I bought Sheen and it did not activate once (I checked, I know there's delay). Sheen animation did not appear, and there was no extra damage on next hit after ability. After the game finished, I went on and created a custom game ARAM and Sheen procs there. So it's either a rare bug of some kind, or Sheen doesn't work on TT for Trundle for some reason.