Anivia egg

When playing Anivia, I used teleport right before I died and turned into an egg. Instead of turning into an egg however, I instadied. Upon respawning, I was an egg, In chat I was still eggnivia. I could still cast abilities, but could not autoattack. When my passive came up, I killed myself to see if I would go back to being the bird, but I just instadied and the passive went on cd again.