Possible bug with vladimir, turret, or both??

It happened to me earlier when playing ezreal. It was me and vladimir on bot first outer tower. I used my ult but it disappeared. It didn't even hit the creeps... He also saw it too. I would say it's a similar interaction that you see in this video which also happened with a vladimir next to a turret: https://youtu.be/mU-i5jNoB94?list=PLRILbAMFFjpzCLaBIdQd9ny1FWqc0cK7F&t=152