PHP-CS-Fixer: Problem with custom attribute

Bug report

PHP 8.0.2 (cli) (built: Feb  4 2021 18:10:29) ( NTS )
Copyright (c) The PHP Group
Zend Engine v4.0.2, Copyright (c) Zend Technologies
    with Zend OPcache v8.0.2, Copyright (c), by Zend Technologies

PHP CS Fixer 2.18.2 Remote Void by Fabien Potencier and Dariusz Ruminski
Runtime: PHP 8.0.2

php vendor/bin/php-cs-fixer fix src/Controller/Security/Abo/ConfirmAboController.php --verbose

Code:

<?php

declare(strict_types=1);

namespace App\Controller\Security\Abo;

use App\Entity\Abo;
use App\Entity\User;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Security\Http\Attribute\CurrentUser;
use Symfony\Component\Routing\Annotation\Route;

#[Route('/abo/confirm/{aboSecret}', name: 'foo')]
final class ConfirmAboController
{
    public function __invoke(Abo $abo, Request $request, #[CurrentUser] ?User $user = null): Response
    {
return new Response('hi');
    }
}

leads to:

Files that were not fixed due to errors reported during fixing:
   1) /Users/oskar.stark/dev/cockpit/src/Controller/Security/Abo/ConfirmAboController.php
error sending signal urgent I/O condition os: process already finished
exit status 64

Changing to:

-    public function __invoke(Abo $abo, Request $request, #[CurrentUser] ?User $user = null): Response
+    public function __invoke(Abo $abo, Request $request, #[CurrentUser] ?User $user): Response

ends up in a non ending process and my macbook starts to explode 🤔

Changing to:

-    public function __invoke(Abo $abo, Request $request, #[CurrentUser] ?User $user): Response
+    public function __invoke(Abo $abo, Request $request, #[CurrentUser] User $user): Response

Cs-fixer can fix and lint it, but my code is not working anymore 😄

cc @localheinz @derrabus