In Neo4J , Loading a Parent Node is loading duplicate children with id=null

Question

Following is the model with A(UserN) and B(UserRoleN) as objects.

@NodeEntity()
public class UserN
{
    @GraphId
    private Long id;
    @Relationship(type = "hasRole", direction = Relationship.OUTGOING)
    private List<UserRoleN> role;

    public void setId(Long id) {
        this.id = id;
    }

    public Long getId() {
        return id;
    }

    public void setRole(List<UserRoleN> role) {
        this.role = role;
    }

    public List<UserRoleN> getRole() {
        return role;
    }
}


@NodeEntity()
public class UserRoleN
{
    @GraphId
    private Long id;
    private String name;

    public Long getName() {
        return version;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public Long getId() {
        return id;
    }   
}

In the database, following is graph structure:

    A->B

While loading A, session.load(A.class, id, 1) , a total of 2 B-Objects are loading under A Object in which one of the B's ID is null and other B object ID is neo4j generated.

Unable to understand why the duplicate B is loaded where Database has only one B Object.