Errors when Yoast activated | WordPress.org

I had several issues in WP Admin where hover menu’s didn’t work and some settings panels were messes up. I tracked it down to be caused by the Yoast plugin. There are no problems when Yoast is deactivated and they are back when I activate it. Also when activating, I get a huge load of errors in the developer console.

Here is a quick screen recording to show the problems.

WP Site Health doesn’t show problems with Yoast deactivated, but it won’t load when Yoast is active.

WP, themes and all plugins are up-to-date. I already reinstalled WordPress and Yoast, but that doesn’t fix the problem.

I have compared php version (8.0) and extensions with another site that has the same configuration/theme/plugins and no problems, and can’t find the issue.

In the end I installed the jQuery Migrate Helper plugin (because there were some jQuery errors in the console) and if I set jQuery to legacy all problems are gone.

Do you have any idea what could cause these issues? Or how to further investigate? I don’t have them on other sites with the same Yoast version, but somehow, on this site Yoast is the trigger for these issues.

Thanks!
JP

The page I need help with: [log in to see the link]

 

This site will teach you how to build a WordPress website for beginners. We will cover everything from installing WordPress to adding pages, posts, and images to your site. You will learn how to customize your site with themes and plugins, as well as how to market your site online.

Buy WordPress Transfer