Hi there andertrack,
So that we can start to isolate this behavior, what audio source are you using when you play this content from Apple TV+? Are you using the built-in speakers, headphones, or AirPlay? Does this happen with any other content outside of Apple TV+?
Let's also ensure your Mac is fully updated as this installs security updates and bug fixes that can resolve issues like this. These steps from Update macOS on Mac show how:
1. Before continuing, it's a good idea to back up your Mac.
2. From the Apple menu in the corner of your screen, choose System Preferences.
3. Click Software Update in the System Preferences window. Can't find Software Update?
4. Software Update now checks for new software.
• If Software Update finds new software, click Update Now or Upgrade Now to install. You might be asked to restart or enter an administrator password.
• If Software Update says that your Mac is up to date, then no new software is currently available for your Mac model.

Cheers!