Whether it was an intentional change or not (which would be strange if it was intentional considering this was never mentioned in patch notes), Touch of Malice stuns unstoppables intrinsically now because of the blinding effect on Charged with Blight. Shoot a blight at an unstoppable champion and they will stun. Sometimes it’s buggy and doesn’t work but that only leads me to believe even more that it was an unintentional change. Anyhow, there’s an answer.