Using SurfaceControl:MovableInsulation with MaterialProperty:GlazingSpectralData

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I am trying to add a transparent SurfaceControl:MovableInsulation object to a roof using WindowMaterial:Glazing as the material, which references a MaterialProperty:GlazingSpectralData object specifying wavelength-dependent optical parameters.

However, it does not appear that the glazing spectral data influences my results when used with the movable insulation. Any thoughts on why these properties don't seem to get applied properly? I've run SurfaceControl:MovableInsulation with SpectralAverage instead for the glazing material optical data type, and results seem to update as expected given the spectral parameters provided (reflectance, transmittance).

Here is a snapshot of the objects I am using:

SurfaceControl:MovableInsulation,
  Outside,                          ! Insulation Type
  Surface 8,                       ! Surface Name
  TransparentInsulationMaterial,    ! Material Name
  Always On Discrete;               ! Schedule Name

WindowMaterial:Glazing,
  TransparentInsulationMaterial,            !- Name
  Spectral,                                 !- Optical Data Type
  SpectralSchedule,                         !- Window Glass Spectral Data Set Name
  0.005,                                    !- Thickness {m}
  ,                                      !- Solar Transmittance at Normal Incidence
  ,                                      !- Front Side Solar Reflectance at Normal Incidence
  ,                                      !- Back Side Solar Reflectance at Normal Incidence
  ,                                      !- Visible Transmittance at Normal Incidence
  ,                                      !- Front Side Visible Reflectance at Normal Incidence
  ,                                      !- Back Side Visible Reflectance at Normal Incidence
  0.0,                                      !- Infrared Transmittance at Normal Incidence
  0.9,                                      !- Front Side Infrared Hemispherical Emissivity
  0.9,                                      !- Back Side Infrared Hemispherical Emissivity
  0.162714;                                 !- Conductivity {W/m-K}

MaterialProperty:GlazingSpectralData,
  SpectralSchedule,                         !- Name
   ! WL   T    Rfront Rback
0.1, 0.3, 0.1, 0.1,
0.2, 0.3, 0.1, 0.1,
0.3, 0.3, 0.1, 0.1,
0.4, 0.3, 0.1, 0.1,
0.5, 0.3, 0.1, 0.1,
...

Thanks in advance!