Convert pmx file into fbx then re-import the fbx and its displays weird

I have downed a pmx format model.
I followed the tutorial, use the add-on “Cats Blender Plugin” to convert it into fbx format.
https://www.youtube.com/watch?v=r8oKoQmyEtc&ab_channel=Clipmaker

But when I use blender to import the fbx file, models looks weird…

Wondering why…could someone tell me?(BTW,this fbx can be imported into game engine normally

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No direct help but I was playing around with this one a bit https://github.com/powroupi/blender_mmd_tools (last mod ~ a week ago)
(which is a fork of the original japanese one? sugiany 7 years old now)