This has been fixed in version 2.6.7. Thanks to the developer for the fix in particular and for the plugin in general!
I had an old version, I completely replaced the old folder with a new one and everything works. This is a temporary solution, as I hope the developer will help. Disable plugin updates in the admin panel! Then unpack my archive and replace the “custom-field-suite” folder with a new one directly on the hosting. It is possible to do this through the admin panel Plugins, delete this plugin and download the zip archive – I have not tried this method. Therefore, it is better to follow my path, as it works. Custom-field-suite version 2.6.5: https://drive.google.com/file/d/19AtXrgSkqX9SJ4RmmNEczlBKRgcw1YG2/view?usp=sharing
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This reply was modified 2 years, 1 month ago by andrework83.
I installed the previous version of the plugin 2.6.5 on WordPress, the latest version to date is 6.5.2. This combination works.