[Gameplay] Moving Doesn't Un-Ready Your Spells

I'm going to use Fiddlesticks as my example champion, since I did more extensive testing in customs with him, but this bug affects all applicable champions that I play with. Side note --- I play with a trackpad with my attack-move mapped to the spacebar if that makes a difference

I pick Fiddlesticks and spawn in the fountain. I put my first level in W (Drain) and press W. The blue range-indicator comes up for the ability, but since I am in the fountain I obviously can't target anything, no problem so far... I click space to move somewhere else to cancel my spell-cast and remove the circle, but nothing happens. Fiddlesticks remains in place and the blue range-indicator is still up. I try clicking space many more times to move and eventually Fiddlesticks begins to move (I found that the command registers roughly 1/4 of the time in this circumstance) but the blue range-indicator is still up.

Some additional details: --Pressing escape removes the blue range-indicator --Flashing removes the blue range indicator --You can freely switch between available abilities while "stuck" like this --When the blue range-indicator was down, pressing space to move registered 100% of the time and functioned normally

Any help would be greatly appreciated and I can answer any further questions if need be. Thank you!