Originally reported by Griomo in community forum (about beta and v-2023-02-29:

[When] specifying an already present attribute (i.e. recording date "1994-09" → "1994-09-06") by batch adding it anew, the result is duplicate credits. [Previously to v-2023-02-28] the credit "merges" OK.

Here is another example with setting producer's "task" attribute originally mentioned by chaban : edits about Karl-Heinz Schneider and "Cello Concerto in A minor, op. 129: III. Sehr lebhaft"