What do the red squares in the Editions card mean?

In the Editions card on a book's page, each square is a chapter: lime when translated, dark when still pending, and red when the translation failed. A failed chapter keeps whatever it had before, because BookyAI only replaces a chapter with a complete, verified translation. From version 1.9.22, when chapters fail, a note under the edition's row says how many and why, with a "Try again" button that translates the missing chapters again. Hover a square to read that chapter's own message. An amber ring means the original chapter changed after it was translated.