Anivia didn't go into her egg

I was fighting Syndra as Anivia with help from Vi. I died from Syndra ult with my egg passive still up (my passive did not proc during the fight). I am almost positive that I was also using my Q when I died.
The screen shot was taken directly after i spawned and it shows that Anivia's passive is still up.
Later in the game i was killed by Lee Sin and and Anivia's passive did proc.
My passive did NOT go on cd.