I created and added two "page" categories to the site menu with different page names. In the first page, I added the WYSIWYG Editor widget, inserted some text, saved it, and the text was successfully saved and displayed. Then I switched the menu to the other category and returned to the first page, but the text was gone.

 

I tried several times to add the text I needed, but it kept disappearing. In the end, I decided to delete this page in the admin panel and create a new one with the same name. Now, there's an error.

Invision Community v5.0.0 Beta 8

Have you added the patch here first of all?
 

https://invisioncommunity.com/forums/topic/480856-hungry-well-beta-8/page/2/#findComment-2985393

Uploaded in zip file Patch/Node and Output to the System folder

Not sure what to do else

Please see the following, which I believe will be relevant to yourself

 

Thank you. Fixed.