Hi Denis thanks for your question.
Can I just check what version of Percona Toolkit you are running please? I found reference to a bug here [url][PT-940] LP #940253: pt-archiver: Wide character in print - Percona JIRA which suggests the issue is fixed. It seems to be something that occurs intermittently.
There are a couple of suggestions in the bug post too. If you have a test environment though, would be best to check those out there first.
Anyway, let me know about the version, Percona Server or MySQL versions, environment etc and I’ll see if I can get someone to check that for you.
Thanks!
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