PHP PDO call Procedure and then select from temporary table

Question

I have a protocol that creates a temporary table and I need to select it right after. I’m using Pdo and always returns some error, in my last code gives error 500 and do not know where to go.

$proc = $this->conn->prepare("CALL proc_busca_disponivel(?)");
    $proc->bindParam(1, $id_evento, PDO::PARAM_INT, 4000);
    $proc->execute();
    $proc->closeCursor();

    $stmt = $this->conn->prepare("SELECT * from LISTA_DISPONIVEL");
    $stmt->execute();

    $res = $stmt->fetchAll(\PDO::FETCH_ASSOC);

    var_dump($res);

I am not the one making the database. If I run the queries in the mysql panel, it returns perfectly, so I conclude that I am missing in Pdo. I also activated and deactivated Pdo buffler, as I had indicated this in the error in other attempts to create the code, but so far I did not exceed error 500.

$this->conn->setAttribute(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, true); //ou false dá no mesmo