There is issue on locale forums with sub…

There is issue on localeLocale Locale = language version, often a combination of a language code and a region code, for instance es_MX denotes Spanish as it’s used in Mexico. A list of all locales supported by WordPress in forums with subforums that have Cyrillic letters in slugs — server returns 404 error. You can see it on Serbian or Bulgarian forum.

I don’t know when this started, one user just reported it on Serbian forum, but I’m sure that not long ago it worked without problems.

Note that topics with Cyrillic letters in slugs work normally.