reported as [#29376] BMESH_TODO: remove tessface CD_ORIGINDEX layer for a single mesh there could be 3 origindex mappings stored, one on the polygons and 2 on the tessfaces. (CD_POLYINDEX and CD_ORIGINDEX). as Andrew suggests, now tessfaces (which are really a cache of polygons), using origindex to point to polygons on the same derived mesh, and polygons only store the original index values.