after a WordPress update, my fields in pages and posts are no longer displayed (backend).
In addition, I can no longer save changes in the settings. Example: If I want to change the content type from “Post” to “Page” under “Show these fields if”, the setting jumps back to “Posts” after saving. The same for all other settings, such as “Position”. Create new fields works.
I have disabled all plugins and in the fuctions.php I have nothing special to ACF.