HUGE Cassiopeia/Teemo aoe bug with new patch

Just played a game as support against a Teemo/Cass bot lane. Cass' pool as well as teemo's shrooms weren't displaying any animation (just to avoid saying that teemo shrooms were invisible...) you would walk down an empty lane, no explosions, no animations, no warning randomly start walking slower and taking poison damage... Cass pools were invisible the entire game so we'd be taking damage and not even know they're there. Please fix this or disable Cass, because this is STUPID OP!!!!