[Gameplay] Soraka's silence field after an invulnerable/untargetable effect ends

There have been multiple times now where I drop Soraka's silence field on someone in Zhonya, or aimed where a Fizz will land after being untargetable, and they are still able to flash and use abilities afterward even though they're IN the silence field. In my most recent game a Nidalee came out of Zhonya and killed a teammate because she could use abilities when she should have been silenced.

How to replicate:

1. Give Zhonya to any champion, or choose a champion who can temporarily go untargetable
2. Go untargetable/invulnerable and have another player put Soraka's silence field on you.
3. As the ability/item nears the end of its timer, spam Flash or another ability to make it activate as soon as the protection ends.

I've had this issue occur repeatedly now, across multiple games and champions. Most often it occurs after a Zhonya trigger, with the after-ability instances being about half as often.