[GAMEPLAY] Ekko procs rapid firecannon before he blinks to his target

I played a custom game today where I decided to see if rapid firecannon worked with ekko's E. It did, but it had an unexpected side-effect. The rapid firecannon procs before he a blinks to his target. In addition, if Ekko last hits an enemy unit with his E-empowered auto-attack while having stacked his rapid firecannon; he will not blink, and instead proc the passive without his E proccing(if that is how you spell it :p) effectively giving him two ranged autoattacks. Rito pls.

How to reproduce: Buy rapid firecannon on Ekko and use his E while you have 100 stacks on the item.