Miss Fortune Quick Cast skill R BUG fail to shoot

Hello ! quick cast doesent work as intended with miss fortune. Well all skills work perfectly with quick cast option except for R ultimate if you press R while u have set quick cast on from option menu it just fail it wont shoot and the skill imediately enter on cool down but not shooting is done. it only works if you use normal cast then R works. (all other champions that i own and play with work well with quick cast no problem)

Hope you can fix this thank you very much have a nice day !