I’ve seen some tutorial for past version, with a plugin in maya, where they wrap the MH body to a sculpted mesh. And they have a step in the process where they “reorder” the vertices.
I wonder if it’s not linked to this. Like the export / re import process would mess up the order somehow and when reimporting, the vertices are all scrambled.
I don’t use Maya so I can’t test this plugin, I wonder if there is something of the sort in blender.