Yes, I hope that by the time they release macOS Monterey they will have fixed it. But so far on beta 6 the popping sound is still happening sadly. 😥I have a MBP16” from late 2019.
No external devices connected whatsoever and issue still happens. I don’t think it’s anything to do with external devices or adapters. It’s an internal issue. I never had it with the previous OS either - same system.
My theory is it’s a software issue - most likely a soundcard driver issue of some sort? Apple resolved it once before with a software update, I’m expecting the same again.