objectbox ToMany relation doesn't work in flutter

Question

I'm using objectbox in my project, i have Playlist entity that include List of Videos, i'm using ToMany class for the List<Video> videos in the Playlist entity, it's looks the video is saved successfully but when I pull it back from the objectbox, it's doesn't appear.

As you can see in line 154 the video is saved, and in line 156 can't get it back

Here's my code:

late ObjectBox objectBox;

class ObjectBox {
  late Box<Video> videoBox;
  late Box<Playlist> playlistsBox;

  ObjectBox._create(Store store) {
    this.videoBox = store.box<Video>();
    this.playlistsBox = store.box<Playlist>();
  }

  static Future<ObjectBox> create() async {
    Directory doc = await getApplicationDocumentsDirectory();
    final store = await openStore(directory: p.join(doc.path, "videos"));
    return ObjectBox._create(store);
  }

  void createPlaylist(String title, Video video) async {
    Playlist playlist = Playlist(title);
    video.playlist.target = playlist;
    playlist.videos.add(video);
    await playlistsBox.put(playlist);
    List<Playlist> list = await playlistsBox.getAll().toList();
    print(list);
  }
}

Playlist entity:

@Entity()
class Playlist {
  @Id()
  int id = 0;
  @Index()
  final String title;

  @Backlink()
  final List<Video> videos = ToMany<Video>();

  Playlist(this.title);
}

Video entity:

@Entity()
class Video {
  @Id()
  int id = 0;
  @Index()
  final String videoId;
  final String title;

  final playlist = ToOne<Playlist>();

  Video(this.videoId, this.title);
}