Can we make Kha'Zix's stealth visible by control wards ?

Serious question. I don't talk about his active but his passive (when you take the evolved R). Why he is allowed to walk without care about control ward, when {{champion:28}} {{champion:107}} {{champion:29}} have to do ? I don't care if it's short, it's still long enought to walk bush from bush and staying stealth.
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