Blitz power fist hits untargetable champs (fizz, vlad, etc.) [GAMEPLAY]

I've noticed this a lot and it's actually maddening how often the untargetable abilities actually get bugged like this. It seems like every two or three patches, there is some skill that you can be hit with while untargetable. This time it's blitz's knockup. As fixz you'd think that after being hooked I would be able to E out of the knockup but this is not so.

I have witnessed the issue on separate occasions both on rift and aram. It happens also with vlad and I can only assume Elise as well.

Pretty sure this is a bug since it more or less negates the fact that you become untargetable only to get cc'd in midair so that you can't escape anyway.

Rito pls fix.

Thx!