@Moonfish I was struggling with the same problem and stumbled upon a solution. If you take the URLs from dropDestination and convert them all to bookmark data and then back into URLs the new URLs will work as expected. let bookmarks: [Data] = urls.compactMap { try? $0.bookmarkData(options: [.withSecurityScope, .securityScopeAllowOnlyReadAccess]) } let urlsFromBookmarks: [URL] = bookmarks.compactMap { var stale = false return try? URL(resolvingBookmarkData: $0, options: [.withSecurityScope], bookmarkDataIsStale: &stale) }

And it's back! I opened Xcode and was again met with the download window and subsequent failure. My feedback FB15398248 is still open and unanswered.

FWIW this problem resolved itself earlier this week.