[GAMEPLAY] Anivia's 'Q' Disappearing

Anivia's 'Q' disappears almost immediately after being cast and reappears upon detonating. This happens at least once per match and usually only during the laning phase. It seems to only occur when the projectile passes through a group of minions, however, the bug seems to appear somewhat randomly within these parameters. So far I have observed this occurring on both the base model Anivia and Blackfrost Anivia. How to reproduce: 1: Go to a lane containing enemy minions AND and enemy champion 2: Cast 'Q' so that the projectile passes through enemy minions (it does not have to contact the enemy champion) 3: After a while one of the 'Q' projectiles will disappears and then reappear upon detonating