I have the same issue on xcode13 beta1 and beta2. Our project build failed in either debug configuration or release archive. Last week (with beta1) I tried creating a sample project using Kingfisher. and the sample app builds successfully without this error, kingfisher worked well.

beta3 still has this issue.

To me, the latest xcode 13 (13A233) is able to archive project attached FB9178663 https://github.com/ffittschen/radar.apple.com/tree/main/FB9178663%20-%20Swift%20Compiler%20throws%20errors The issue should be resolved by apple.