Nested gprims not supported (only when I apply OmniPBR Material)

I got the error “Nested gprims not supported” only when I add OmniPBR and when I do not when It works fine.

Here is the Kit:
kit_20230904_133346.log (8.3 MB)

This is the OpenUSD’s default behavior. Geometries cannot be parented under other geometries.
Can you please show the steps you’re taking that results in that error?
If possible, sharing your stage can help in troubleshooting this issue.