[Gameplay] Fizz can lose immunity after the end of the game

If you use Fizz's Playful/Trickster right before the end of the game, the natural deactivation of the ability appears to override the global vulnerability provided by the end of the game, causing Fizz to become vulnerable, and can then die to the fountain turret. I was able to create this scenario while playing a 5v5 AI Intermediate game.