I don't see the public link either.
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I have the same problem. Did you ever figure this out?
I was finally able to solve this. I noticed that my crash was related to Swift Package Manager. Using Xcode 11, I removed the SPM dependencies one by one, then opened in Xcode 12. I was able to find the problematic dependency and rebuild it. Now the project opens in Xcode 12 with no issues.