UserType.php

<?php
class UserType extends \Symfony\Component\Form\AbstractType
{
    public function buildForm(\Symfony\Component\Form\FormBuilderInterface $builder, array $options)
    {
        $builder->add('name', CompoundType::class, [
            'inherit_data' => true,
        ]);

        $builder->addEventListener(\Symfony\Component\Form\FormEvents::POST_SET_DATA, function (\Symfony\Component\Form\FormEvent $event) {
            $child = $event->getForm()->get('name');
            $child->getConfig()->getEventDispatcher()->dispatch(FormEvents::POST_SET_DATA, new FormEvent($child, $event->getData()));
        });
    }
}