Twitch Passive interaction with Dark Harvest

Twitch Passive Bug with Dark Harvest?
or is it intendet?
So yesterday i played a game with Dark Harvest twitch because why not? Then i realised his passive doesnt even proc Dark Harvest, is this intendet? Comparable with Teemos Poison for example does procc Dark Harvest indeed, but what about Twitchs Passive? See Video
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