Bug when transforming [Gameplay]

I have tried this on Elise and Rek'Sai so far. When you start to cast a spell using quick cast, but switch forms before you actually cast it, you cannot ping. You have to switch back to the form the original spell was cast in to fix this. From what I've tested you can still cast all other spells, and even attack structures and minions, as well as attack champions. The bug does not appear to be reproducible with normal casting on.

The cursor seems to be stuck in "ability casting" mode.

Edit: Also you cannot click on the map to move the camera. Spells that work in both forms that are targeted, like Exhaust or Ignite, do not cause the bug to occur