I just burned a DTS ticket on this, and also linked to this thread. Hopefully that gets a response soon.

Disabling Bitcode looks like it works. But then running that build from TestFlight on a iOS 14 device, and it will crash on launch. When run through Xcode in that same device it doesn’t crash. got a reply on the DTS ticket. They just pointed to the release notes and disable Bitcode work around. They ignored where I said doing that work around just causes the app to crash.

The only thing I’ve confirmed that works is changing the deployment target to >= iOS 15.0, or deleting all Swift concurrency support. I tested both, but I have settled on dropping Swift concurrency support. Maybe I will try it again in a few years after others have figured out the issues.