Now I see why you did what you did. "US29Bus/87" puts up a duplicate label error as it is still under the "US29Bus_S" label.
Anyway removing "US29Bus/87" under "US29Bus_S" is the only option here.
The only list file using this line according to the Github search ""NC US158" "US29Bus/87" is dave1693. I will notify him via Github as he updates regularly.
EDIT: Saying "only option" is technically incorrect, but keeping the "US29Bus/87" label is the best option here IMO.