I have a MacOS app that I last notarized about a year ago with no issues. This time, however, when I created the initial Archive, the Organizer put it into a section called 'Other Items' instead of in the 'macOS Apps' section with all of the previous Archives. In addition, and more distressingly, when the Archive is selected, the button says 'Distribute Content' instead of the expected 'Distribute App', and pressing it simple exports the Archive or its contents, without running through the automatic notarizing process.
I suspect I have done something in the last year that somehow invalidates my app such that Xcode no longer recognizes that it is an app. I have followed the suggestions at https://developer.apple.com/documentation/security/notarizing_macos_software_before_distribution/resolving_common_notarization_issues, but that did not provide any relevant clues.
I am using Xcode Version 13.4.1. How do I figure out what is preventing Xcode from offering to notarize the app?