Falling due to slipping on ice is not triggered by mouse/F

I'm not sure if this is intended, but falling due to slipping is not triggered by using your mouse to move.

For clarification, I was holding down left click the whole time, even while slipping. Using F to move towards something to attack it also does not trigger falling, even if it is held during the whole animation.

Also, predictive lag compensation leads to the character teleporting back slightly during the sliding animation without fail.