Assigning Materials to Geometry Caches with Python

Development Pipeline & Plugins Editor Scripting
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Trying to assign materials based on name. This is not working for GeometryCaches. The material slot names come up empty. Can you see why?

geom_cache_list = []
# directory of alembic imports
target_content = unreal.EditorAssetLibrary.list_assets("/Game/HR/Seq/Cloth/")
for each in target_content:     
    asset_data = unreal.EditorAssetLibrary.find_asset_data(each)

    asset_class = asset_data.get_editor_property('asset_class')
    if asset_class == "GeometryCache":
        geom_cache_list.append(each)

for item in geom_cache_list:    
    geom_cache = unreal.load_asset(item)
    gc_component = unreal.GeometryCacheComponent()
    gc_component.set_geometry_cache(geom_cache)
    msn = gc_component.get_material_slot_names()
    print(f"msn: {msn}")
    # result []