You can reproduce the problem by creating an table that have a Full-text index and then search with charset other than latin1.
For reproducing the bug you should use several other indexes along the full-text search.
For example:
SELECT t.* FROM threads t WHERE [some other search based on indexes] MATCH (t.subject) AGAINST ('Some Arabic/Persian Text') >= '3' ORDER BY t.tid DESC LIMIT 0, 10;
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Bug
Blocker
