Mining Fatigue Only Affects Swinging Animation, Not The Actual Hitting.

i put an mining fatigue level 125 on my map but i noticed that when i swing, i hit the mob before my arm reaches him, but that's not the problem, the problem is that when the slow swinging animation is playing, i can hit mobs even though my arm is still in the middle of the animation.

this shouldn't happen as mining fatigue should decrease hitting rate.