The issue is actually with the AC-4 audio codec. Plex doesn’t support it because they’re not licensed for it. There’s a thread around here somewhere from years ago; I’ll link it if I can find it.
But the short version is that Plex’s Live TV & DVR feature doesn’t currently support ATSC 3.0 channels. I personally wouldn’t hold out much hope for it.
[Edit]
Here’s the thread to which I was referring:
There are others, but they generally point back to this one.
For what it’s worth, 13.1 WLOS (ATSC 1.0) is the only station in the area I have any trouble tuning. Due to my location, The HDHomeRun can’t determine whether it should use the Asheville tower or a translator in Pickens. Some scans will find one, or the other, or neither. And neither will tune reliably.
The ATSC 3.0 channel, 113.1, works great in the HDHomeRun app, as you’ve noted. So, I too, would like support for AC-4 audio eventually.
