Some forum topics with long Cyrillic slugs cannot be opened

[SergeyBiryukov]

Sometimes there are topics with similar slugs, but only one of them can be opened, because the second one redirects to the first one, or vice versa.

And old example (but it happens with recent topics too):
​http://ru.forums.wordpress.org/topic/Вывод-последних-записей-из-каждой-категории (ID 23625)
​http://ru.forums.wordpress.org/topic/Вывод-последних-записей-из-каждой-категории-1 (ID 23627)

The former redirects to the latter. This becomes confusing:

• You can't just delete the duplicate topic. Whichever one remains, redirects to a 404 page.
• Sometimes it's not a duplicate, but a legitimate question from two different people, and a redirect to someone else's topic is unexpected and violates the forum rules.

Should be fixed with the upgrade to bbPress 2.x. This ticket is just for tracking and reference.