Airboundary Issue?

Hi All - I am having an issue getting Airboundary walls to work. I set them up in Grasshopper just fine:

But in the resulting OSM they just appear as interior walls?

I am running on Mac, Rhino8, LBT 1.9.0, OpenStudio Application 1.9.0. Example rhino project and grasshopper files:
test ab.gh (88.8 KB)

Rhino 3dm: test_ab.3dm