Avatar Mask is doesn't ignore unchecked transform

Hi i have third person game project. I use avatar mask to split upper and lower body animation.
And i uncheck the bone called "aimer" in 2 avatar mask, because i want to use it for aim.
But in animation still using the "aimer" bone and i can't change it's rotation.

Upper body avatar mask:

Lower body avatar mask:


Why the animator playing kerframes about "aimer" bone?
I tried to remove ker frames about "aimer" rotation in animations, but it's still playing.