[GAMEPLAY] Bug w/ Blackfrost Anivia's Q

I am experiencing a bug with Blackfrost Anivia. From what I have noticed it does not occur on the original skin, but it does occur infrequently on the Blackfrost Anivia skin. The conditions for the bug usually are that I throw Anivia's Q through minions or enemy laner abilities. I don't lose the ability to detonate the ice ball, but the ice ball is no longer visible as it continues to fly and it does not return to visibility. It seems to only happen when there are layers of graphics that the ice ball is traveling through. This has happened in PVP and bot games at least 7 times in 5 games.