8 – Unable to submit data when rendering a web form programmatically

I'm working on a Drupal 8 project, when I try to load a web form programmatically into a controller, the web form is rendered correctly, but when the data was submitted, no value was found on the results page of the Web form (always empty).

Inject the form into a paragraph as a block, then submit the data work perfectly. Submitting data from the web form node page works normally (you can find data on the form's results page).

Here is my code:

MonContrôleur.php

Drupal namespace  my_module  Controller;

use Drupal  Core  Controller  ControllerBase;
use Drupal  webform  Entity  Webform;

MyFormPage class extends ControllerBase {

public service content () {
$ webform = Webform :: load (& # 39; my_webform_id & # 39;);
$ view_builder =  Drupal :: service (& # 39; entity_type.manager) -> getViewBuilder (& # 39; webform & # 39;);
$ webform = $ view_builder-> view ($ webform);
return [
        '#theme'   => mycontroller_page',
        '#content' => [
          'title'     => t('I am a page from your controller'),
          'form'      => $webform,
        ],
];
}
}

MyController-page.html.twig

{{}} Content.title

{{}} Content.form

An idea of ​​this behavior?
Thank you