使用Neo4jRepository::save(spring-data-neo4j-6.1.5)保存下面的Dater类时，保存挂起且永远不会返回。我认为这与我的Dater对象有关，该对象具有由引用接口的集合定义的关系，而不是具有@Node注解的类。这是新4J的问题吗？

//PersistentDaterMusicItem is interface. Is there a problem doing this?
    @Relationship(type = "LISTENS_TO_MUSIC")
    private Set<PersistentDaterMusicItem> musicItems = new HashSet<>();

//parent
@Node
public class Dater{

    @Id
    @GeneratedValue
    //set of different implementations of PersistentDaterMusicItem
    @Relationship(type = "LISTENS_TO_MUSIC")
    private Set<PersistentDaterMusicItem> musicItems = new HashSet<>();

}

//inteface 1
public interface PersistentLibraryMusicItem extends PersistentDaterMusicItem{
    LocalDateTime getAddedDateTime();
}

//interface 2
public interface PersistentListenedMusicItem extends PersistentDaterMusicItem{
    LocalDateTime getListenedDateTime();
}

//impl 1 of PersistentDaterMusicItem
@Node
public class ListenedAppleSong extends AppleSong implements PersistentListenedMusicItem{

    @Id
    @GeneratedValue
    private final Long id;

}

//impl 2 of PersistentDaterMusicItem
@Node
public class LibraryAppleSong extends AppleSong implements PersistentLibraryMusicItem{

    @Id
    @GeneratedValue
    private final Long id;

}