If I did not adopt the new TimelineProvider changes, I would not be able to run the app locally on a device from Xcode.
I did adopt the changes, the issue is related to TestFlight.
Mr. Brightside
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I wish that was the case but that happened in Xcode 12 beta 3.
Please see the same problem here:
https://developer.apple.com/forums/thread/655393
Could you please create a feedback and mention mine (FB8107534) as well? This way there is a better chance that Apple engineers will notice this and make this improvement.