'Updating to Firebase iOS SDK 9.0.0 fails (Invalid diagnostics signature)

My iOS-App worked like a charm with Firebase 8.15.0.

Now I changed the Firebase package dependencies to version "9.0.0 - Next major" and get a lot of errors, which I can't link to the breaking changes related to this major release.

I already cleaned the build folder, restarted Xcode and my MacBook, but nothing helped.

Most likely the underlying problem has to do with the warning "Could not read serialized diagnostics file: error("Invalid diagnostics signature")":

Build Errors



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