Here's a link to some code to reproduce this issue:
https://github.com/destari/macos-outlinegroup-bug
destari77
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Switch the deployment target to 14.x and it should magically appear in your file navigator.
I have the same issue with Version 12.2 beta 2 (12B5025f).
Yea looks like Beta 7 and Xcode 12.2 have ripped it out for macOS. Sheesh. Release notes would be nice..