[GAMEPLAY] Snow Day Singed poison trail invisible when Singed is out of sight

Pretty straightforward here. When Singed has the Snow Day skin and uses his poison trail and goes into a bush or otherwise leaves vision, the entire poison trail disappears visually.

The ability will still damage, but without sight of Singed there is no way to know the poison trail is there.

Edit: Now with video

This is with 6.20, so it's definitely not related to the 6.21 patch, and you can see in the video how when Singed is out of sight his poison trail disappears but continues to damage. I know this is in spectate mode (I didn't have the client running while I was playing) but it shows up the same in-game.