What
The theme picker (the screen for choosing colours and syntax highlighting) shows a hint when you press a key once, telling you to press it again. That hint now ends with either "cancel" or "exit". Which word appears depends on a new internal flag, so it can read "Press X again to cancel".
Why
The last word of the hint tells you what the second key press will do, so it is worth reading before you press again.
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
The finding does not say which situation makes the picker show "cancel" rather than "exit".