When attempting to import an MMD animation, it just throws an error attempting to. Tried on blender 4.2.8, 4.3.2, and 4.4.0, both before an after using Fix MMD Model ...
So I've cleaned up an MMD model, exported it as FBX into other software and created some animations for it (more like retargetted), then I've put it back in blender and tried to export it as vmd but ...