Sanguine Blade doesn't work on Garen? Why???

Title. the new item {{item:3181}}'s passive AS does not work on Garens E, as in it does not give it more Spin procs. Currently Garens E only gains spin procs off of Base AS, AS per lvl, and AS from items. This is directly form Leagues site info regarding Garen, and its how it has worked since the cahgne "Attack speed from items and levels increases the number of strikes" Well {{item:3181}} is an item. And Garen E doesn't gain any benefit from it. Why?
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