The following error appears at ezpublish/console cache:clear :

"Cannot use eZ\Publish\SPI\User\Identity as Identity because the name is already in use in /.../vendor/ezsystems/ezpublish-kernel/eZ/Publish/Core/MVC/Symfony/Security/User/HashGenerator.php on line 13"

Cause :
Identity is already defined in namespace eZ\Publish\Core\MVC\Symfony\Security\User see eZ\Publish\Core\MVC\Symfony\Security\User\Identity class

Confirmed on 5.2+ (can't check on 5.0+)

Pull request available at https://github.com/ezsystems/ezpublish-kernel/pull/776