Did you ever find a solution? We're having a similar issue with libSwift_Concurrency.dylib, which is signed by Apple itself, being reported by AppStore Connect as having an invalid code signature. I ran codesign -dvvvvvvv on this lib and the code signature in the one we uploaded seems to be Apple's so I'm pretty unclear what's going on.
Topic:
App Store Distribution & Marketing
SubTopic:
App Review
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