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Use `pavucontrol-qt` 

It can be used to investigate configuration of output - in my case comparing what pavucontrol shown with and without docking station indicated that dock was recognized as "USB headphones".

I can change output on playback tab but it was not sticky - sometimes survives a reboot, sometimes just stopping playback is enough to cause problems

I can go to configuration tab devices and disable USB audio, what worked fine in my specific case. Actual headphones continue to work.

Solution found thanks to Lubuntu Telegram channel ( https://t.me/c/1119905515/70653 ).