Control rig deformations

Hi everyone, so I rigged the default unreal Mannequin (Manny) in Maya, then animated it , then exported the skeleton in unreal with no problem, the problem apears when I try baking the animation to control rig, it loses its postprocessing deformation and only the skin deformation works
3animbrseq
2animbake
1animshow
but if I retarget the animation to the skeleton and then bake it to control rig it works fine
4animcopy
5animbakeshow
I just want to understand why its happening