While testing Flutter applications on macOS 26 beta with Xcode 26 beta, iOS builds consistently fail during Flutter.framework codesigning with: "resource fork, Finder information, or similar detritus not allowed" Investigation suggests newer Xcode beta versions now reject additional extended attributes beyond com.apple.FinderInfo during codesigning. Flutter tooling currently removes only: xattr -r -d com.apple.FinderInfo Replacing it with: xattr -cr successfully resolves the issue. Environment: macOS 26.4.1 beta Xcode 26.4.1 beta Apple Silicon (ARM64) Flutter 3.41.9 Flutter issue: https://github.com/flutter/flutter/issues/186372 Apple Feedback Assistant report: FB22756923 Interested to know whether other developers on Xcode 26 beta are seeing similar stricter codesigning validation behavior.