Ability Cancelling W/ Space Bar, No matter what

[xklbst]

This bug has been in the game since around the time i began playing, back during the 5 hero patch with Drifter and Doorman etc ~ october of last year. I am a MnK player, so as far as i know, It is an issue on Mo but im unaware if this affects other characters. Currently, regardless of settings, Spacebar will always cancel combo. I have tried everything, from unbinding cancel ability, to binding it to a random num pad key, turning off ability press to cancel, etc etc. No matter what, combo will cancel upon pressing spacebar. If needed can provide video. Yoshi plz fix