I'm not sure if it's a bug or a misconfiguration on my part.
While the Communicating with Controllers documentation section stated that COM1 and COM2 should be able to work at the same time (listen only, of course), I am able to listen only to the COM channel I set to both listen and transmit (and of course, I can choose to transmit only on one of these). FS2020.
Is there something I'm supposed to do, to configure this ability, and I might have missed? Didn't find anything on the website...