Rek'Sai Tunnels across walls [Gameplay]

At the end of the day, did not really hurt anything in my game, but still annoying to deal with and can be a huge risk when it forces me to blow my flash or give up on the gank. Edit 1: The bug itself is that even though the tunnel is built, Rek'Sai does not follow through to get to the other side of the wall.