How to validate ajax form and get errors in symfony?

Question

symfony

Hello!
The registration form is rendered by react and submitted by an AJAX request, but after I do $form->submit(...) , $form->getErrors() doesn't return any errors even though $form->isValid() === false . If you render the form $form->createView(); then everything works.

Questions:
1. How can you validate a form without creating your own validator with an ajax request, the form is rendered by react, not $form->createView();
2. How can I generate a Symfony\Component\HttpFoundation\Request to pass it to $form->handleRequest($request); based on data that comes fromAn AJAX request , roughly speaking that $reques t be the same as a normal form submission when the form is rendered by the $form->createView() server.

entity:

use Symfony\Component\Validator\Constraints as Assert;

class RegisterData
{
    /**
     * @var string
     * @Assert\NotBlank()
     * @Assert\Email()
     */
    public $email;
    /**
     * @var string
     * @Assert\NotBlank()
     * @Assert\Length(min=6)
     */
    public $password;
}

The form:

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;

class RegisterDataForm extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options): void
    {
        $builder
            ->add('email', Type\EmailType::class)
            ->add('password', Type\PasswordType::class)
        ;
    }

    public function configureOptions(OptionsResolver $resolver): void
    {
        $resolver->setDefaults([
            'data_class' => RegisterData::class,
        ]);
    }
}

Controller:

public function request(Request $request, SignUp\Request\Handler $handler, Validator $validator): Response
{
    $data = new RegisterData();
    $form = $this->createForm(RegisterDataForm::class, $data, ['csrf_protection' => false]);

    if($request->isXmlHttpRequest()) {

        // $request->request->set($form->getName(), $request->request->all());
        // $form->handleRequest($request); // так тоже не работает
        $form->submit($request->request->all());

        // $form->isValid() === false 
        // $form->getErrors() - пустой 
        ...
    }
}

ps data is sent obviously invalid, everything works with valid ones.