Visual Bug for charged abilities

So I first noticed this during URF mode playing Pyke. While charging his Q (quick cast) the ability's aiming line appears on the ground, similar to Vi Q and even Varus and Xerath Q (shows range). But after a certain amount of charge time, the aiming line completely disappears, giving me no indication as to where I am aiming.

Thankfully I'm not an idiot, so the ability works per usual if I put my mouse in the right spot. But it is still very off-putting.