After enabling Joomla Error reporting and Debug I get this error:
Warning: getimagesize(https://xxxxxx.rs/images/slike/2022/11/xxxxx.jpg): Failed to open stream: HTTP request failed! HTTP/1.1 403 Forbidden in /home/xxxxxx/public_html/plugins/content/smartresizer/smartresizer.php on line 525
Joomla 4.2.5
PHP 8.1.9