OK, after doing some digging into the problem today (I'd like to record a couple of the college football games) I <think> I found a solution that works for me.

I became superuser and changed into the/Library/LaunchDaemons/ directory, and did a directory listing there. Something that stood out to me ...

An excellent idea!

I wasn't aware or had forgotten there were recording programs for linux, but that probably works better for me than my Mac mini. I've got an always on linux box with an AMD Ryzen 9 processor which is much faster than my M1 Mac mini. I downloaded the recorder app for that and it's ...

I had the HDHomeRun enabled in Local Network, since I've had to do that some years ago if my memory is correct.

Interestingly, HDHomeRun shows up twice in "Local Network" for some reason??? Toggling either of the HDHomeRun items toggles the other as well.

I can ping the HDHomerun from my Mac, and ...

I am also seeing this exact issue after "upgrading" to Mac OSX 27. My HDHomerun tuner device ID is 10A8AED0 FLEX 4K. I have an older tuner as well, but that one is currently offline...