Kate K from DisplayLink tech support got back to me suggesting I use Activity Monitor to quit "coreaudio". I don't have that as a process, but do have "coreaudiod". I forced that process to quit and it immediately started back up and the sound came through the DisplayLink audio jack just fine.
Interesting work-around, but not a final fix. Not sure if the fix is with MacOS or DisplayLink having to deal with the new MacOS.
I logged an issue via Apple's Feedback Assistant as well.
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