[GAMEPLAY] Kha'zix lost his wings, visual bug?

So I was playing Legend of the poro king as Kha'zix and I had my evolved my wings (E) They start showing normally but then when I jumped to the poro king the disappeard? I hadn't jumped to him in between the time I evolved and the time that I did. we didn't notice this until later, the people I played with could also see it. Gives quite a disadvantage to my enemies if they don't see that I can reset on kills/assists. I think I've seen this bug before, but just in normal games. This happens everytime kha'zix has his wings evolved and jump to poro king