Symfony version(s) affected

5.4, 6.0

Description

Autodetecting mapping type works based on @Entity annotation, but it ignores @Embeddable annotation. In result, Symfony crashes with a
Class App\ValueObject\Foo is not a valid entity or mapped super class
error.

How to reproduce

PHP 8.0+.

1. Add to config/packages/doctrine.yaml these lines:

App\ValueObject:
       is_bundle: false
       dir: '%kernel.project_dir%/src/ValueObject'
       prefix: 'App\ValueObject'
       alias: App

Docs says annotation is a default value for type, so omitting it.
https://symfony.com/doc/current/reference/configuration/doctrine.html#mapping-configuration

2. Add a value object to src\ValueObject using an @Embeddable annotation:

<?php

namespace App\ValueObject;

use Doctrine\ORM\Mapping as ORM;

/** @ORM\Embeddable */
class Foo
{
}

3. Use this value object somewhere in your entities.

4. Symfony crashes with an error:
   Class App\ValueObject\Foo is not a valid entity or mapped super class
   because it detects annonation type by presence #[.*Entity or * @.*Entity, but not Embeddable.
   And it fallbacks to attribute instead of annonation on PHP8.

Possible Solution

$this->getMappingObjectDefaultName() should return (?:Entity|Embeddable) instead of Entity I guess.
https://github.com/symfony/symfony/blob/6.1/src/Symfony/Bridge/Doctrine/DependencyInjection/AbstractDoctrineExtension.php#L292

Additional Context

No response