There's already a thread here: https://developer.apple.com/forums/thread/660664 This is a frequent daily FAQ Mmmm, it's an "emerging trend" that Apple is investigating, per their support reps. They sent me an investigative questionnaire. So... apparently not.

This isn't an iOS-14-specific problem. I uploaded a new build of an app that's been relatively unchanged for months, and the build is never shown in App Store Connect. I can upload it (with Xcode reporting success) over and over with the same build number and no complaint about duplicates. Apple is aware of the problem. Support told me this is "an emerging trend," and sent me a questionnaire soliciting more info (much of it inapplicable). However, you should still contact them and report it, so its seriousness is clear. The thing is... it isn't a new problem. You can find copious reports of this going back years. Even worse is that the only workaround for testing, ad-hoc distribution, is essentially undocumented. It's also pretty much unusable, because there's no apparent way for users to give you their phones' UDIDs... except physically plugging them into a Mac!

I second the OP's call for this, which is even more important with Catalyst. At the moment I don't know how to selectively implement serial communications on the Mac while using Bluetooth under iOS (which is what the app does currently). Filed feedback FB8385366. I can hear the wheels of industry turning already.

I also filed a report on this, referring to the one above.