Jade Fang Cassiopeia Miasma Bug

During a normal 5v5 game on summoners rift whenever cassi would cast her W (purple aoe dot spell) when using the jade fang skin, the animation would go off at the beginning but the rest of the animation was invisible and the pool would still be on the ground, invisible and doing damage. It is unknown if this issue is just with the jade fang cassiopeia skin, or appears on the other skins, but makes it very hard to play against her.