The memo shared with Apple Authorized Service Providers reads as follows:
If a customer hears a popping sound when playback is stopped on their MacBook Pro (16-inch, 2019)
When using Final Cut Pro X, Logic Pro X, QuickTime Player, Music, Movies, or other applications to play audio, users may hear a pop come from the speakers after playback has ended. Apple is investigating the issue. A fix is planned in future software updates. Do not set up service, or replace the user’s computer, as this is a software-related issue.
Shortly following the launch of the 16-inch MacBook Pro last month, some customers began to voice concerns about the popping sound issue across the MacRumors forums, Apple Support Communities, Reddit, and elsewhere. The exact cause is unclear, but Apple confirms it is a software issue, not a hardware issue.
Apple seeded the fourth beta of macOS Catalina 10.15.2 to developers for testing today. It is unclear when the fix will be implemented.