Selecting a different sound device does not change the output
Gnome 3.38.4; opensuse "20210330"; 5.11.6-1-default x86_64
In Settings :: Sound :: Output I select a different Output Device, test it. The sound continues to go to the original device, not the one just selected. There are no messages in the system journal.
Settings likes to ignore devices that are USB- and Bluetooth-connected.
Edited by James Moe