Jayce E Knockback Bug

This has been in game for so long, & it's incredibly annoying.

When Jayce E's you it knocks you away from him. However if you flash say behind him during his E wind up it'll still knock you back in the direction you were prior to your flash.

It should function that it knocks you back in the direction based where you are standing when the dmg is dealt to you, not when Jayce presses the E button.