message: Fix MDL sheen BSDF
  Similar to the other BSDFs, mx_sheen_bsdf also needs to pass the volume properties to the next layer.
diff: @@ -305,7 +305,10 @@ export material mx_sheen_bsdf(
  base: mxp_base.surface.scattering,
  normal: mxp_normal
  )
  - )
  + ),
  + // we need to carry volume properties along for SSS
  + ior: mxp_base.ior,
  + volume: mxp_base.volume
  );
  export material mx_thin_film_bsdf(
  