[Gameplay] Invisible Jinx Traps!

I was trying to steal dragon as with smite. I was on the left side of dragon pit ready to Deceive(Q) in, but I noticed placed traps. I did not see the traps at my destination... so I went for it anyways. As soon as I land, BAM! traps appear from under my feet and root me. There was a ward in the pit the whole time, so it shouldn't be fog of war... I think..