I have the same issue on my new MacBook Pro 16 inch. I just bought it and went to a local Apple store to replicate the issue on their new demo computers.
We tested 4 demo Macbook Pros. 3 of the 4 we can replicate the issue.
Steps to replicate:
1) Open Youtube.com/SoundCloud.com
2) Play a media content with audio
3) Jump to another webpage, you will hear an audible POP as the system exits the page.
4) If you don't hear a pop,... navigate to previous page, and repeat step 3.
Tested YouTube/Soundcloud on Safari, and Google Chrome (2 different browsers with 2 different webpages)
Tested Spotify by exiting the application instead of skipping to new song, creates a popping sound. Spotify Application has a built-in gradual descent on the audio, to 'mute' the sound instead of actually cutting the audio out completely like the other applications.
I don't know if we are allowed to post links, but here are some additional forums with same discussion.
Dear Apple, do you plan to address this hardware/software issue? I am inclined to say it is a driver/firmware issue, but only your company is able to provide this statement.