[BUG] Often WeldEdge on a flat zone of a mesh destroy vertex normals

[AlanMattano (Soaring Stars lab)]

Yes that works!
After rebuilding the normals, still some wont weld
If I export as OBJ and import that, the welding can be done
[BUG] To be able to _WeldVertices of a mesh converted from SubD you need to export and import as OBJ