Roman Pots visualization not working when geometry dumped into ROOT file

### Environment: (where does this bug occur, have you tried other environments)
- Which branch (`main` for latest released): main
- Which revision (`HEAD` for the most recent):
- Any specific OS or system where the issue occurs? Mac/Docker
- Any special versions of ROOT or Geant4? No

### Steps to reproduce: (give a step by step account of how to trigger the bug)
1. Produce geometry: geoConverter -compact2tgeo -input [compact_file.xml] -output [geometry].root
2. Open resulting file using a ROOT TBrowser. Other geometry component render just fine, but not the Roman Pots. It's likely to do with the overtly complicated structure to generate the geometry.

### Expected Result: (what do you expect when you execute the steps above)

I except to be able to see the detector geometry.

### Actual Result: (what do you get when you execute the steps above)

I do not see the detector geometry.