displacementMotionSolver on different mesh region

displacementMotionSolvers access points0 through

    IOobject io
    (
        "points0",
        instance,
        mesh.meshDir(),
        mesh
   );

This should be

    IOobject io
    (
        "points0",
        instance,
        polyMesh::meshSubDir,
        mesh,
    )

instead since the name of the mesh is already encoded in the mesh.name() and mesh.dbDir()