Ward in bot brush not working.

Im speaking of the bush that is on Red side river wall next to bot lane, you know the one people ward every game constantly? yeah that one has a pretty big bug that i noticed a few games ago. If the ward is put in the bush and the ward is "too close" to the wall the ward will not given vision as if a ward is in the bush which usually gives vision of the full bush and the surrounding area. Instead the ward will technically be in a gap between the ward and the wall and not give vision of any of the bush and hardly any of the surrounding area .