If you use the serialized hooks cache introduced by
request #12475 the login tentative will fail with a fatal error.
Reported error:
PHP Fatal error: Tuleap\OpenIDConnectClient\Authentication\StateManager::validateState(): The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition "Tuleap\OpenIDConnectClient\Authentication\SessionState" of the object you are trying to operate on was loaded _before_ unserialize() gets called or provide an autoloader to load the class definition in /usr/share/tuleap/plugins/openidconnectclient/include/OpenIDConnectClient/Authentication/StateManager.php on line 69