Taliyah's vector W issue casting on moving objects?

Edit: does the spell itself cancel if I am moving while attempting to cast it on a target? I seem to be having an issue getting her W to actually cast on moving objects in the game. I've been practicing in custom with the jungle and I cannot seem to get her W to cast reliably anymore. I'm playing with quickcast fyi. Pretty much what happens is when I attempt to cast her W on an object, the game will show the blue range indicator and the direction that I intend to aim it, however, if "cast" directly on top of a moving object the spell will simply display the directional indicator and stop there. The spell will not be cast so long as my cursor is hovering over said moving object. I don't know if this is simply how the spell is intended to be now or if this is actually a bug. Either way it's made simply practicing her a bit irritating because I can't even get her W to cast if I intend to use it on a moving object in the game. Is it just me? I really don't want to stop playing her but this has made actually playing her affectively like I have done in the past seemingly impossible. I'm really hoping that I am simply doing something wrong or that this is a bug. I desperately seek help as Taliyah is one of my favorite mages to play.