Laravel Octane problem with `php://input`

I am using 3rd party library. In this library there is code like this :

    public function __construct($input_source = "php://input")
    {
        $raw_notification = json_decode(file_get_contents($input_source), true);
        $status_response = Transaction::status($raw_notification['transaction_id']);
        $this->response = $status_response;
    }

in line $raw_notification = json_decode(file_get_contents($input_source), true); , variable $raw_notification always empty. But, when I dump it using request()->all() the raw data in the request body is not empty.

Because this error happen in vendor, I can't edit this code. How to fix this?