After uploading a debug build to testflight getting an email stating "ITMS-90755: Invalid Binary - The following binaries in your app contains prohibited instructions: AppName.app/App. Remove the instructions from the binaries, rebuild and resubmit.".
To the best of our knowledge we haven't added any prohibited instructions of any kind, and the email also doesn't provide any information on what the offending instruction is. After much trial and error we found switching a property from an array to a non-array makes the error go away and testflight accepts the build, which obviously doesn't make any sense as to why that change produces this error.
Is this some kind of false positive happening or what else is going wrong?
Any help to resolving the issue is much appreciated.