Symfony version(s) affected: 4.4.8
php version 7.2

Description
After upgrading from Symfony 3.4 to Symfony 4.4.8, I have a problem during the authentication process.
When the token is retrieved from the session and try to be unserialized, I have this error:

Argument 1 passed to Symfony\\Component\\Security\\Core\\Authentication\\Token\\AbstractToken::__unserialize() must be of the type array, string given, called in /data/vendor/symfony/security-core/Authentication/Token/UsernamePasswordToken.php on line 103 at /data/vendor/symfony/security-core/Authentication/Token/AbstractToken.php:200)"}

In this function of the UsernamePasswordToken.php file:

    /**
     * {@inheritdoc}
     */
    public function __unserialize(array $data): void
    {
        [$this->credentials, $this->providerKey, $parentData] = $data;
        parent::__unserialize($parentData);
    }

$parentData is still serialized. Or, it should be an array. The declaration of __unserialize takes in an array.

Of course, after if I cleared my cookies, everything works well, but it's not the best solution.

How to reproduce
Do an authentication with Symfony 3.4.
Upgrade to Symfony 4.4.8 with the same PHP version (7.2)
Try authentication.

Does Anyone reproduce also this issue?
Some help is appreciated :)