＞ログ上でエラーログ等は出力されていますか？
確認したところこのようなエラーが出ていました。
php.INFO [8a2506d1] [6590278] [1] [Symfony\Component\ErrorHandler\ErrorHandler:handleError:532] - User Deprecated: The default value of the "$secure" and "$samesite" arguments of "Symfony\Component\HttpFoundation\Cookie::__construct"'s constructor will respectively change from "false" to "null" and from "null" to "lax" in Symfony 5.0, you should define their values explicitly or use "Cookie::create()" instead. {"exception":"[object] (ErrorException(code: 0): User Deprecated: The default value of the \"$secure\" and \"$samesite\" arguments of \"Symfony\\Component\\HttpFoundation\\Cookie::__construct\"'s constructor will respectively change from \"false\" to \"null\" and from \"null\" to \"lax\" in Symfony 5.0, you should define their values explicitly or use \"Cookie::create()\" instead. at /home/*****/www/*****/vendor/symfony/http-foundation/Cookie.php:97)"}