If I try to merge some recordings, one of which I've rated, the rating will not be displayed on the subsequent "Merge Recordings" page – they are all simply gray.

This was verified by reosarevok on #musicbrainz-devel with the following extra info:

15:28 < reoafk> It's a bug. It's just the showing though - the entering a rating works fine
15:28 < reoafk> (if I change the rating from the merge page, it applies the change and it shows on the recording page)