Hello Vladimir, I am glad I helped you.
Here is the link to my ticked opened at the Theme’s support forum, they are usually very helpful!
https://alkaweb.ticksy.com/ticket/1117251
Can you take a look and see if there is something we can figure out together? I realized that for posts themselves is working fine the 404 thing it is even working for custom post types, the problem is actually happening on PAGES restrictions.
Regards
Giacomo
