Having property of a same class in Symfony ApiPlatform

I have gone over the ApiPlatform SymfonyCasts and so far I love what I can do with it. However, I have hit the wall with the following scenario:

• I have a class Contract with property baseContract which points to an object on which the new object should be based upon.

• Both denormalizationContext and normalizationContext are set for all fields (for now) to contracts:write and contracts:read, respectfully.

• When I go to /api, both GET and POST endpoints show all properties, but skip the baseContract...

Is there some gotcha to this?

The very basic idea is that I want to be able to post something like this:

{
  "name": "string",
  "description": "string",
  "contractNo": "string",
  "baseContract": "/api/contacts/{some_id}
}

    /**
     * @ORM\Entity(repositoryClass=ContractRepository::class)
     *
     * @ApiResource(
     *     normalizationContext={"groups": "contract:read"},
     *     denormalizationContext={"groups": "contract:write"},
     *     collectionOperations={
     *          "get",
     *          "post"
     *     },
     *     itemOperations={
     *          "get"
     *     }
     * )
     */
    class Contract
    {
......
        /**
         * @ORM\ManyToOne(targetEntity=Contract::class)
         * @ORM\JoinColumn()
         *
         * @Groups({"contract:read", "contract:write"})
         */
        private ?Contract $baseContract;