Amature modifier problem

Hi,
I tried to create a shapekey with the armature modifier. Normally it worked well but in this file it didnt save the movement in the shapekey.

The problem is only with the “facebones”, if I try to do shapekeys with the armature modifier with the body bones it worked well.

Am I doing something wrong? IF yes pls tell me.

Thanks for your help .
rig.blend (1.7 MB)