Pool Party Zac bug

I have encountered a bug with pool party zac. It´s simple- when he castst his E, it is supposed to show slight shadow on the ground, so you know where he is flying. I literally didn´t see the shadow neither in game, nor in replay i watched after the game to ensure it really was a bug. Since Zac came into meta again, it is highly problematic. I almost lost my game solely because of this bug. Please try to solve this as soon as possible.