为什么在Symfony 5上使用DateTime约束时会收到"This value be be of type string“？

use DateTimeInterface;

class YourEntity
{
    private ?DateTimeInterface $date;

    // getter and setter
}

use Symfony\Component\Form\Extension\Core\Type\DateTimeType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Symfony\Component\Serializer\Normalizer\DateTimeNormalizer;

class YourFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            // other form fields
            ->add('date', DateTimeType::class, [
                'widget' => 'single_text',
                'model_timezone' => 'UTC',
                'view_timezone' => 'UTC',
            ])
        ;
    }

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