Exclude file system based library playlists from migration (#13059)

Emby.Server.Implementations/Library/Resolvers/PlaylistResolver.cs

@@ -28,7 +28,7 @@ namespace Emby.Server.Implementations.Library.Resolvers
         {
             if (args.IsDirectory)
             {
-                // It's a boxset if the path is a directory with [playlist] in its name
+                // It's a playlist if the path is a directory with [playlist] in its name
                 var filename = Path.GetFileName(Path.TrimEndingDirectorySeparator(args.Path));
                 if (string.IsNullOrEmpty(filename))
                 {

Jellyfin.Server/Migrations/Routines/RemoveDuplicatePlaylistChildren.cs

@@ -46,6 +46,7 @@ internal class RemoveDuplicatePlaylistChildren : IMigrationRoutine
             IncludeItemTypes = [BaseItemKind.Playlist]
         })
         .Cast<Playlist>()
+        .Where(p => !p.OpenAccess || !p.OwnerUserId.Equals(Guid.Empty))
         .ToArray();
 
         if (playlists.Length > 0)