We also had this problem and updating to Xcode 13.2.1 solved this issue.
From https://developer.apple.com/documentation/xcode-release-notes/xcode-13_2_1-release-notes
Resolved Issues
Fixed an issue where apps built with Xcode 13 or Xcode 13.1 sometimes crashed at launch with an error reporting that the libswift_Concurrency.dylib library was not loaded. This only affected apps that used Swift Concurrency features (such as async/await), deployed to iOS prior to 15, tvOS prior to 15, or watchOS prior to 8, and had bitcode enabled. (86349088)
Hope this helps
sebastien-tribu
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