Hi Ed, FB19732875
Great! This information is en route back to you in Feedback Assistant, but I'm sharing here for everyone's benefit in the future.
Your app is getting this message because it happens to have a malformed Objective-C protocol list.
One way this can happen is if older compliers are involved in the build of your app, including the builds done for any libraries that you depend on. Please make sure that your app is built with a recent version of Xcode. You may need to contact support for any vendor libraries you depend on to make sure you have a version of that library that has also been compiled with a recent Xcode version.
The other way this can happen is through build post-processing that obfuscates your binary. If you have anything in builds scripts or other steps in your build process that do this, then you should remove those steps, and verify if an upload to the App Store without that post-processing is accepted as a way to check if that is the source of this issue for you.
— Ed Ford, DTS Engineer