How come Zyra's plants don't proc Manaflow Band? They proc everything else

They proc keystones and other Runes They proc item effects {{item:3116}} {{item:3151}} {{item:3285}} They count as spells being blocked by {{item:3102}} I just find it odd how tagging someone with a Q-plant will proc all of these things but it wont work with Manaflow Band.
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