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UPDATE:
I disabled pipewire and ran the session under pulseaudio / jack... and to my surprise, I got the same result. There seems to be something funky with Qtractor's ability to route internal connections on my system. This appears to apply to the Ubuntu repository install and the latest several appimages.

I seem to remember Qtractor behaving with this kind of bus routing limitation in a version/install years ago, but I haven't seen this kind of problem since. I'm baffled!?!