API Platform: Hide properties in /api/contexts/<entity>

Question

When working with the API platform (Symfony) I only expose some of my entity's properties to the API. That works pretty good with groups, the output DTO and DataTransformer. When opening the API under /api/<entity> I get the results with only the defined/grouped properties.

However when having a opening the contexts under /api/contexts/<entity> ALL properties are listed. How can I reduce those properties as well?

Symfony Version: 6

Api Platform Version: 2.6.8

Entity:

/**
 * @ORM\Entity(repositoryClass=EntityRepository::class)
 * @ORM\HasLifecycleCallbacks()
 * @ApiResource(
 *     normalizationContext={"groups" = {"api:read"}},
 *     collectionOperations={"get"},
 *     itemOperations={"get"},
 *     order={"title"="ASC"},
 *     paginationEnabled=false,
 *     output=EntityApiOutput::class
 * )
 */
class Entity
{
    /**
     * @ORM\Id
     * @ORM\GeneratedValue
     * @ORM\Column(type="integer")
     * @Groups({"api:read"}) */
    private $id;
    
    // other properties without '@Groups'

EntityApiOutput:

class EntityApiOutput
{
    /** @Groups({"api:read"}) */
    public int $id;

    /** @Groups({"api:read"}) */
    public string $title;
}