[wp-forums] Topics with Cyrillic slugs cannot be found via Google

[Sergey Biryukov]

All of the topics with Cyrillic slugs on ru.forums.wordpress.org
cannot be found via Google for some reason. Topics with Latin slugs
are indexed properly.

I remember encountering this about two years ago, however there were
just a few posts, so it was not a big issue at the time.

Same for bg.forums.wordpress.org and sr.forums.wordpress.org.

Not sure what the problem source could be. Is it possible to fix this?

Sergey