Api Platform 3.3.8 introduce the the new _api_disable_swagger_provider flag inside extraProperties (see the commit). Inspired by the test found in the commit, I tried to use it here :

#[ORMEntity(repositoryClass: UserRepository::class)]
#[ORMTable(name: '`user`')]
#[ORMUniqueConstraint(name: 'UNIQ_IDENTIFIER_EMAIL', fields: ['email'])]
#[ApiResource(operations: [
    new Get(),
    new GetCollection(),
    new Post(),
    new Put(),
    new Patch(),
    new Delete(),
    new Get(
        name: 'user_activate',
        read: false,
        uriTemplate: '/users/activate/{token}',
        controller: ActivationController::class . '::activate',
        openapiContext: [
[...]
        ],
        extraProperties: [
            '_api_disable_swagger_provider' => true,
        ],
    ),
    new Post(
[...]
    ),
])]
class User implements UserInterface, PasswordAuthenticatedUserInterface
[...]

It does not work, I don’t know why. I find no error any where, just a 404 response, from Swagger…
Anyone can help ?

I emptied the cache, restarted the server, asked the question on Github, look at all logs…