The GLTF importer is abnormal

Support
1

glTF extension KHR_materials_specular is used in this model, but not supported by this loader. The extension will be ignored.
glTF extension KHR_materials_ior is used in this model, but not supported by this loader. The extension will be ignored.

How to avoid problems.
Thanks.
箱式变压器.glb (1.7 MB)

2

These extensions are not supported, there is nothing to do but contribute to VTK to implement them.