Anivia and Zhonya's bug

I was playing URF with some friends today as Anivia, and during the game quinn used her dash and knock up move on me whille I was in egg form. While I was in egg form I was spamming the use zhonya's key, as to use it if I came back to life, and when quinn knocked me in the air I was able to use my zhonya's and was in stasis in egg form.