Gameplay bug with Rek'Sai tunnels.

I was in a game where the enemy had a Rek'Sai jungler. At one point in the game, he was just outside our base and was making a tunnel, and died mid-creation. This left just one half of the tunnel on the map, which we could not destroy, and the tunnel was not decaying over time and disappearing, yet he could still dash right to our base using this half of a tunnel, leaving us with no options to counter it.