[GAMEPLAY] Wards detonate Teemo's shrooms

I was playing a Teemo game (cut me some slack, I'm bronze) and I noticed my shrooms kept exploding without anyone going near them. Then I saw that enemies' expiring wards, besides leaving debris, destonated my nearby shrooms. I even tested it again just to make sure. I saw my enemy put down a stealth ward and i planted my shroom there, when the ward expired and left the debris, my shroom was detonated. This makes the vision aspect of the shrooms quite useless, since they're mostly placed in warding points (at least early on). It occured on about 5 occasions on the game I've played.