Doctrine ManyToOne不会级联持久化

I'm trying to do the following :

/**
 * @Entity
 */
class Player {

    /**
     *@Column
     *@Id
     */
     private $uuid; //gets assigned a Uuid in the constructor

    /**
     * @ManyToOne(targetEntity="Team", cascade={"persist"})
     * @JoinColumn(referencedColumnName="uuid")
     */
     private $team;

     public function setTeam(Team $team) {
         $this->team = $team;
     }

     //...
}

/**
 * @Entity
 */
class Team {
    /**
     * @Column
     * @Id
     */
    private $uuid; //gets assigned a Uuid in the constructor

    //...
}

$player = new Player;
$team = new Team;
$player->setTeam($team);
$entityManager->persist($player);
$entityManager->flush();

The team is not persisted in to the database.

I do not want to call $entityManager->persist($team) as in my case, the Team is created in a part of the code where I don't have knowledge of persistence.

My expectation is that the cascade={"persist"} option should make the EntityManager also persist the Team. Why is my expectation wrong or what am I doing wrong?

I was not mistaken... This works as expected!

Taking a second look, there was never a flush after a added the Team to the Player.
Reading my own question again, I realised what that I missed it...
I should talk to my rubber duck more often, so it seems...