$browser->close(); is not working and it exit after idle_timeout only

[beshoo]

Describe the bug
Page take long time to close. it only close when idle_timeout is reached but not when I use $browser->close();

Reproducible example

<?php
error_reporting(E_ALL);
ini_set("display_errors", "1");

require 'vendor/autoload.php';
use Nesk\Puphpeteer\Puppeteer;

$puppeteer = new Puppeteer(['idle_timeout' => 10]);
$browser = $puppeteer->launch([
  'ignoreHTTPSErrors' => true,
  'headless' => true,
  'devtools' => false,
  'idle_timeout' => 30,
  'args' => [
                        '--disable-gpu',
                        '--no-sandbox',
                        '--no-first-run',
                        '--disable-setuid-sandbox',
                        '--no-zygote',
                        '--disable-dev-shm-usage',
                        '--disable-dev-profile',
                        '--user-agent="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.61 Safari/537.36'
],
]);

//and auth if need
$page = $browser->newPage();
$page->goto('https://api.my-ip.io/ip');
$html = $page->content();
$page->close();
$browser->close();
print_r($html);

Expected behavior
Exit the PHP processes once reach print_r($html); but the case it is hang on for 10 sec then exit, which is the idle_timeout

Environment (please complete the following information):

• OS: Linux server3.net 3.10.0-962.3.2.lve1.5.42.el7.x86_64 API documentation #1 SMP Mon Nov 9 08:11:18 EST 2020 x86_64 x86_64 x86_64 GNU/Linux

• Node version: v14.17.6

• PHP version

 PHP 7.4.23 (cli) (built: Sep  2 2021 13:47:56) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
[MAX]root:[/home/beshoo/www/phpchrome]

My Node package manager is:

• NPM 6.14.15

[th-lange]

I think we are affected by that too...