phpwkhtmltopdf: Hangs indefinitely when exporting a password protected page (using --cookie)

I’m currently facing an issue where, if I add --cookie as an argument and pass in a sessionid, the request hangs indefinitely. However, when remove the --cookie, it works just fine but then the page exported to PDF becomes the login page of the site. I’m unable to export pages that requires some sort of authentication.

Here’s a snippet example:

$options = [
    'binary' => 'C:\Program Files\wkhtmltopdf\bin\wkhtmltopdf',
    'commandOptions' => [
        'useExec'     => true,
        'escapeArgs'  => false,
        'procOptions' => array(
            // This will bypass the cmd.exe which seems to be recommended on Windows
            'bypass_shell'    => true,
            'suppress_errors' => false
        )
    ],
];
$pdf = new Pdf($options);
$pdf->addPage($link_to_html);
$pdf->send();

Is this a known issue? Are you aware of any potential causes of this issue?

Thanks in advance