ATSC 3 seems to be in the “experimental” stage at this point. In my market we have 4 stations using it. None of them have 5.1 sound and even the stereo sound is funky on two of them. I also gave up on recording from them because the commercial detection is just is not reliable yet. Breaks get missed or the algorithm thinks the commercial is in the middle of the show. Not a ding on Channels, I think it’s just early in the debugging of this new tech and making all the various platforms and software reliable. Saw the same thing when HD tv rolled out. Give it time. That is why the ATSC 1 signals are still there.
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A followup...
Over the weekend I was able to get Dallas FOX 104.1 HEVC (presumably ATSC3) to play in Channels DVR on all devices: iMac M1, iPad Pro M1, Apple TV 4k (2nd) and iPhone Xs.
The picture quality 1280x720 appeared same as Dallas FOX 4 (ATSC1). iPad stats from Channels DVR appeared to be the same, data flows similar, but with the notation “hwdec: videotoolbox” in the 104.1 version.