E.g., on https://bookbrainz.org/revision/147632 a number of new identifiers were added which made the previous "identifier 0" become "identifier 5" and instead of showing this neatly, it uses two lines to show that identifier 0 was changed with no indication that that identifier is still there, just elsewhere in the list. This gets even worse in cases where more identifiers are shuffled around, e.g. https://bookbrainz.org/revision/144239 where an MBID was added as identifier 1 moving 5 other identifiers down the list.

Compare with the presentation of a newly added entity with identifiers, the ids are presented just with text and not as a numbered list: https://bookbrainz.org/revision/139400 – this feels like it would make for a better presentation to diff against.