[GAMEPLAY] Draven bug with Rapid Fire Cannon

Hello. Today i encountered a bug on draven with this item, I don't know if it works on other champs too.

[HITTING MINIONS] I don't really know how it works, but the first hit is rather normal, adding the magic damage at the same time the projectile hits, but after loading the passive from rapid fire while staying in combat, the magic damage applies instantly, before the projectile hits. It's not occuring every time, and it works pretty much as inteded with only this item (checked on custom game), but probably this bug is occuring with this item and one or more from my build path (I.E, Essence reaver or maybe berserker's greaves or bloodthirster?)

[HITTING TURRETS] From my custom game I found that only rapid fire gets(dont know if this still works with other items) this bug on turrets. pretty gamebreaking, huh?