I am having trouble with changing master pose component runtime

Hi, I’ve posted this at Answers, but got no answer. Please inform me if I have to delete this post.

I am using Set Master Pose Component to use modular character system. They are sharing same skeleton.

When I change the “master” mesh at runtime, my skeleton system goes broke. (GIF)

But when changed the mesh in editor, nothing happens: (GIF)

Blueprint: (Image)

Thanks for reading, waiting for help…