We have exactly the same issue after upgrading to Xcode 12. Apple, is there a solution to this please?

Having the same problem here too. Even with Xcode 13 beta 2

You don't have to manually create the fat simulator framework with lipo, Xcode will do if for you if you ask right; SCHEME_NAME="MyScheme" FRAMEWORK_NAME="MyFramework" SIMULATOR_ARCHIVE_PATH="${BUILD_DIR}/${CONFIGURATION}/${FRAMEWORK_NAME}-iphonesimulator.xcarchive" DEVICE_ARCHIVE_PATH="${BUILD_DIR}/${CONFIGURATION}/${FRAMEWORK_NAME}-iphoneos.xcarchive" OUTPUT_DIR="./Products/" # Simulator xcarchive (arm64 + x86_64) xcodebuild archive \   ONLY_ACTIVE_ARCH=NO \   -scheme ${SCHEME_NAME} \   -project "${SCHEME_NAME}.xcodeproj" \   -archivePath ${SIMULATOR_ARCHIVE_PATH} \   -sdk iphonesimulator \   BUILD_LIBRARY_FOR_DISTRIBUTION=YES \   SKIP_INSTALL=NO # Device xcarchive (arm64) xcodebuild archive \   -scheme ${SCHEME_NAME} \   -project "${SCHEME_NAME}.xcodeproj" \   -archivePath ${DEVICE_ARCHIVE_PATH} \   -sdk iphoneos \   BUILD_LIBRARY_FOR_DISTRIBUTION=YES \   SKIP_INSTALL=NO # Clean-up any existing instance of this xcframework from the Products directory rm -rf "${OUTPUT_DIR}${SCHEME_NAME}.xcframework" # Create final xcframework xcodebuild -create-xcframework \   -framework ${DEVICE_ARCHIVE_PATH}/Products/Library/Frameworks/${FRAMEWORK_NAME}.framework \   -framework ${SIMULATOR_ARCHIVE_PATH}/Products/Library/Frameworks/${FRAMEWORK_NAME}.framework \   -output ${OUTPUT_DIR}/${FRAMEWORK_NAME}.xcframework