I have this weird output device that, when chosen, directs output to the MBP speakers.
I’m on a 2019 MBP with Big Sur 11.0.1 and beta 16.
This took a bit of digging but apparently AVAudioEngine creates private aggregate devices.
They won’t be shown in the next version. Thanks for reporting this.
Should be fixed in beta 17.
Yes, this was fixed 