Singed's Invisible Poison Trail

When laning against a Singed, most people know not to run around in his (ob)noxious poison gas that he leaves behind him. Usually this isn't hard to do because it is easy to see and avoid. However, if he is leaving a long trail of poison behind him and makes his way into fog of war or a bush (anywhere you cant see him) his poison trail disappears as well. Even if it is damaging you as you run through it, as long as Singed isn't in sight, neither is his poison trail. This is extremely annoying please fix this*[zombie-brand-mindblown]*