[GAMEPLAY]Jade Fang Cassiopeia Invisible Abilities for Enemy Team

I was recently playing a ranked game on my smurf Pilous which is currently Plat II, My friend was fighting a Cassiopeia mid lane and when he was fighting her he commented that he could not see the w poison on the ground and I was like "hahaha very funny". I went and ganked mid lane and I saw that he wasn't lying, apparently everyone on my team said her W poison pool was invisible and that is not a lie you can't see it on the ground and some of her other abilities. The Cassiopeia commented that she and her teammates could see the poison but we were unable to see the poison so it is basically only invisible for the enemy team.

To reproduce this all you have to do is fight a Cassiopeia, I am not sure if its just limited to Jade Fang and you have to be on the enemy team, the poison effect is still there and the slow but you cant see the effected area on the ground at all. Her other abilities I'm not sure about but they should be checked out as well.