At least for some cases in ruwiki timeline is broken by small cyrillic letter х, but if it is replaced by mnemonic х all starts working again. For example see https://ru.wikipedia.org/wiki/Шаблон:Участники_The_Yardbirds

Update: if a page has not been reviewed, I mark current version as reviewed, and Permanent Link option appears. But then, when I mark this version as unreviewed again, Permanent Link option dissapears again, like here

Same error «local-multiwrite» for https://ru.wikipedia.org/wiki/Файл:Карта_Швеции.png, cannot delete, cannot revert to old version (empty 'oldimage' field). Two entries in upload log, only one of them corresponds to page's history.