I’m also experiencing a critical error with the Yoast 21.3 update, which results in my pages becoming uneditable. Full editability is restored when Yoast is deactivated, and lost again on re-activation.
I’m using the free version of Yoast SEO, and the site has never had the premium version installed, so the issue is not exactly the same as that experienced by Chadoner in Fatal Error on Yoast 21.3 Update. The error log ([my-site].php.error.log) has no Yoast-related entries. I’m running WP 6.3.1, using the Twenty-Seventeen theme v3.2, on PHP 8.1.23.
I appreciate that this issue is unusual. I rate the Yoast SEO plugin highly and have used both free and premium versions on different sites for five years without anything similar happening.
The page I need help with: [log in to see the link]