I was playing Ashe on the PBE server. An enemy placed a ward where I could see it, in the center of mid lane. I auto attacked it once, then it went invisible, so I told Ashe to walk forward a little, thinking she would start clearing the minion wave in front of her when she stopped moving. Instead she hit the now invisible ward twice more, destroying it.
The enemy team wouldn't work with me to recreate the bug, so I wasn't able to see if it happens every time, or see what variables matter. It's too late for me to start a new game to try to figure it out, but I figured I should write up a bug report. It'd be cool if someone wanted to try recreating the bug, and posted the results here. Otherwise I'll test the bug out tomorrow morning and edit the results into this post.