Aurelion Sol's stars not proccing Manaflow Band

With the release of patch 9.12, Aurelion Sol's stars no longer stack Manaflow Band. It used to stack it before this patch. I checked the patch notes and there were no changes made to both Manaflow Band and Aurelion Sol so I can only assume that it's a bug. I played 2 games and went into a practice tool game to confirm this and it really doesn't stack it anymore.
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