Remove Transfer Constraints
Download amh2b_v231.zip and use Blender's 'Install add-on from file' button to install from .zip file.
Add function Armature -> Retarget -> Remove Transfer Constraints to remove constraints added to e.g. MPFB2 Rigify armature, e.g. after using NLA -> Edit menu -> Bake Action. This new function works only with this version and later versions.