Blend space animation didn't work when using SetMasterPoseComponent

Development Character & Animation
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1
  1. At first, Blend space animation( about idle and run) works fine.
  2. I Split Character Mesh into 3 parts( Hair, Face and Body)

49485-meshs.png

Mesh is a skeletal mesh with a dummy box;Hair is a skeletal mesh with hair.
3. Execute ‘Set Master Pose Component’ at Event BeginPlay
4. Then, Play and make the character run, blend space animation didn’t work.
But it occasionally work well while passing 2 blocks.

what’s wrong?