Sonata Media Bundle delete image programmatically

Question

It seems that there is no documentation about how to delete images programmatically with Sonata Media Bundle.

I found another post saying that you need to call delete on the media manager.

Here is my mapping:

/**
 * @var Application\Sonata\MediaBundle\Entity\Media
 *
 * @ORM\ManyToOne(targetEntity="Application\Sonata\MediaBundle\Entity\Media", cascade={"persist", "remove"}, fetch="LAZY")
 * @ORM\JoinColumn(name="image_id", referencedColumnName="id", onDelete="SET NULL")
 */
protected $image;

And this is the code I use to delete:

$this->mediaManager = $this->getContainer()->get('sonata.media.manager.media');
$previousMedia = $myEntity->getImage();
$provider = $this->getContainer()->get($previousMedia->getProviderName());
$provider->removeThumbnails($previousMedia);
$this->mediaManager->delete($previousMedia);

The association is correctly remove (the entity image field is now null) but on my gallery the object still exists and looks like this:

What am I doing wrong?