Upon further investigation we found that the build process was referencing two different module.modulemap files for the SwiftBridging module: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/swift/module.modulemap /Applications/Xcode_15.0.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/swift/module.modulemap After renaming Xcode_15.0.1.app to Xcode.app the app is able to build successfully. We also have success when having no Xcode.app file in Applications with this structure: Xcode_14.3.1.app Xcode_15.0.0.app Xcode_15.0.1.app Xcode-beta.app