I'm having the same issue on Xcode 15.4, and not on 15.3. I can reproduce this issue with these steps: Create a new iOS app. Remove Mac for iPad, add MacCatalyst target. Add Sentry SDK package from https://github.com/getsentry/sentry-cocoa.git, adding Sentry and SentrySwiftUI to target. Clean build folder, build and run to Mac. Result: -> Xcode 15.3, works. -> Xcode 15.4, initially fails. Build and run again immediately after, works. On Xcode 15.4, any time that I clean and then build, it first fails and then will succeed. After this the build will always succeed, unless cleaned in between. This has caused our Xcode Cloud builds that recently updated to using Xcode 15.4 to fail, as they just fail and don't try to build again.

Still getting this, on Xcode 15.1 beta (15C5028h) and macOS Sonoma 14.0 (23A344).