Rek'Sai Tunnel Bug

There is a bug with 's tunnels wich is if you create one, sometimes, one of the entrances bugs and stays there for the rest of the match and the enemy team can't destroy it. You can't enter it as the other entrance dissapears, but what makes it a problem that needs solving is that you can cast her ultimate on it. P.S.: It kinda hurts to report this bug because I main her, but I prefer to play a fair match.