Post tags using cyrillic chars multiply in tables wp_term* when updating posts

[StefanMz]

Having the post tag български (with slug bulgarski) and saving changes on a post using this tag, the tag is not recognized as already existent (not increasing "count" in wp_term_taxonomy), but recreated in tables wp_terms, wp_term_taxonomy, and wp_term_relationships again and again.

My observation is, that the previous entry in wp_term_taxonomy linking the existing term with the last post version is replaced by a new entry linking the redundant new term and the post.

The same behavior occurs when using HTML-entities instead of the cyrillic characters български.

MySQL database, db-connection and tables use utf8_general_ci.

I imagine this is a duplicate of another few tickets out there.

Can't reproduce. Do you use a plugin for transliterating slugs, e.g. Rus-To-Lat?

I can't reproduce this either.