I think this would be part of echo cancellation: in a meeting you don't want the data from the meeting to be fed back to it. I suppose it uses the all the streams from the browser then, though I think in general it would be even better to cancel out everything that comes from the speakers. Maybe it can work this way on some other platforms?
E.g. PulseAudio and Pipewire have a module for echo cancellation.
E.g. PulseAudio and Pipewire have a module for echo cancellation.