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For some context, Manamune gives it's mana charges every time you strike a target with an Ability or an Attack. However, for some reason, Manamune isn't giving mana charges from Draven's Q auto attacks, even though it should since Draven Q is an attack. Manamune does however stack on Draven's basic attacks when Spinning Axe isn't activated. So basically Manamune is virtually unusable on Draven because of this.
I am very certain this bug became a thing from the bugfix on Patch 11.2, where they bugfixed Tear of the Goddess interaction with Spinning Axe. So yes, ironically it seems the reason for this bug existing is because of a bugfix 9 patches ago.
For those of you who misunderstood what I said above, I'm not saying activating Draven's Q not stacking Manamune is the bug, I'm saying that Draven's auto attacks with Spinning Axe activated isn't stacking Manamune is the bug. There are also people that think that when I say Manamune is bugged on Draven, I'm saying Tear of the Goddess is bugged on Draven, which it isn't because Tear only stacks off Abilities, not Attacks.
https://reddit.com/link/nmveif/video/8uts4pl7eu171/player
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