Rek'sai Tunnel Bug
If Rek'sai's tunnels are put close enough that you are within range to enter another tunnel while still "inside" of one tunnel, both the tunnel you are currently in and the tunnel you are attempting to enter go on cooldown, but you don't travel through the second tunnel. As far as I know it only occurs with already existing tunnels, not if you are in a tunnel that you just cast.
To recreate:
- Get into game as Rek'sai
- Place 2 tunnels close enough that you would be in range to enter one tunnel at the exit of the other
- Go through the first tunnel and attempt to enter the second tunnel before you exit the first (a lot of people including myself "spamclick")
I know this bug has gotten me killed a few times, and I'm sure others have died from it as well.