Vision Bug

Enemies have vision on units they shouldn't have. Seen pretty clearly in spectator mode (the vision is set to blue team):

https://www.youtube.com/watch?v=MpcemEH08I0&feature=youtu.be

You can tell they see everything in game as well, because they start pinging on Teemo (Yours truly) immidiately. Looks like they lost vision on units the moment they left base.