HOW TO FIX WP EDIT ERRORS.
If your having editing problems on your WP from WP versions from 5 and up Please try and disable the Wordpree plugin Loginizer, if that works then delete it all togeher.
This fix is for all themes that has posts and pages that can be seen but cant in the editors as you cant see the content anymore or you know its there but you simply cant see it!
This fix also sorts other recent WP updates, I have no idea why.
It was easy to find the fix as WP Search Engine Optimization manages over 1200 word press websites in total so you can trust this WP Plugin Fix.