How to restore the functionality of the site on WP after changing the CNC?

Question

WordPress

For more than 2 years, the internal site worked on a standard CNC like " /?p=123 "
There was a need for socialization, I installed BuddyPress. BP requires any CNC other than the standard one. When choosing another CNC in the settings, while accessing any record, I get " 404 Not Found ".
CyrToLat Enh is worth it, ModRewrite is enabled in .htaccess, I tried resaving posts, but it doesn't help.
How can you fix it?

Answer 1

Have you checked the entries? They are displayed correctly if you go into editing and view the entry