squat non-ascii search is broken?

[email protected]
Newsgroups gmane.mail.imap.cyrus
Message-ID <[email protected]>
Hello all.
Looks like, Squat search engine for non-ascii texts is heavily broken in recent Cyrus. The logic of damage is completely unclear for me:
- search for single cyrillic character returns nothing (while nearly all messages definitely contain this character)
- search for longer random seguence of cyrillic characters returns lots of findings (while messages definitely cannot contain this non-existent word)
- search for a real word returns both real and false findings.

Can anyone confirm? 
Cyrus IMAP 3.6.1 Debian 12, default encoding UTF-8. Client programs Thunderbird and Sogo.

Resolved by upgrade to Xapian search engine.

-- Alexey
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Cyrus: Info
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