TestFlight on Mac using App Thinning excludes App Icon

Testing my app on various devices.

  • Run TestFlight on ANY device and TestFlight itself sees my app and its icon.

  • Run TestFlight on my iPad Mini and install latest build - app icon is there, no problems.

  • Run TestFlight on my Mac and install latest build - app icon is missing.

  • Use Xcode to build an ad-hoc distribution, NO app thinning, install distribution on Mac by double-clicking ipa file, app icon is there, no problems.

  • Use Xcode to build an ad-hoc distribution, select 'Mac' for app thinning, install distribution on Mac by double-clicking ipa file, app icon is missing.

If you read the docs for TestFlight, it apparently leverages 'app-thinning' to optimize for each device.

Somehow this thinning process is excluding my app's icon on the Mac.

Bug? Some other issue I'm not aware of?

Thanks in advance.