After upgrading my server and start using PHP8.2, I saw a lot of PHP errors. I found this repository, and upgraded Feedwordpress to use it.
Almost all the PHP errors are now gone (for instance, #136); the only one that remains is:
FastCGI sent in stderr: "/wp-content/plugins/feedwordpress/feedwordpress.php on line 2127; PHP message: PHP Warning: foreach() argument must be of type array|object, string given in /site/wp-content/plugins/feedwordpress/feedwordpress.php on line 2127"
I'm not seeing any obvious (bad) behaviour caused by this, but just in case...