I was trying to find the wehmann5 User page & found this Talk page. I haven't clicked on the link...
...but maybe we could all coordinate better using Talk pages? I think its worth looking into.
Based on Alan's email message on Aug 18 2023, I made the corresponding change to the wiki navigation index to refer to this Main:About Memento Database page instead of the previous Memento Database page, so that the page Vasya is editing is the page that the wiki shows when viewed from the navigation index, as users would normally do.
I clicked on edit for the Navigation index sub-section of the page. When I did "Show preview" I got this error message:
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator at email@example.com to inform them of the time this error occurred, and the actions you performed just before this error.
More information about this error may be available in the server error log.
If I do an edit for the whole page and do "Show preview", no error occurs.
I wasn't intending to do an edit; I was only interested in looking at the code.