Singed poison on treeline (snow day skin)
This isnt actually a glitch but its very annoying on twisted treeline. His poison trail (when wearing the snow day skin) blends in with the ground on treeline quite well. it makes it hard to notice the outside lines of it, or sometimes its hard to even know its there if you have ping or bad graphics.
recomended fixes: giving the poison a faint outline OR giving it a reddish tint to the enemy team