ATIS not registering with the Airport Object (KHEF)

I created a replacement airport package for KHEF using Devmode and most of the frequencies in the Airport Object are there, but the ATIS frequency for the airport doesn’t show in-game in the Communications window, and sometimes when you spawn onto the airport runways, the AWOS for KOKV (Winchester Regional - about 45 miles away) plays instead. The frequency for the KOKV AWOS is 124.85 mHz and the frequency for KHEF ATIS is 125.175 mHz. I’ve double-verified that the ATIS frequency is properly set-up in the Airport object for KHEF so I’m stumped right now. Is there some other step I need to be doing for ATIS?

I have a similar issue – on most projects in the old days I’d unselect Delete Frequencies (or equivalent) to make things easy, and to preserve the existing frequencies. However, this doesn’t work on my current project, NZCH. I’ve returned to development after a long retirement, so I may have forgotten something, so any help would be appreciated.

If I add the frequencies, most of them work, but ATIS won’t play anything, similar to the OP.

What have I missed which prevents me from retaining the default frequencies? And why won’t added correct ATIS frequency work?

EDIT: forgot to mention that I’m using SU4 beta, but had the same result with SU3.