Picard currently maps an album's release date in the MBZ database not to the Release Date frame (RELEASEDATE in Vorbis, TDRL in id3v2.4) like one would expect, but to the Recording Date frame (DATE, TDRC)

Picard also does not map the original recording dates of songs on the album to the Recording Date (DATE, TDRC) frame, like one would expect

(I am a developer for a music server application, running into this bug)

Sources

https://github.com/id3/ID3v2.4/blob/master/id3v2.4.0-frames.txt  see definitions for TDRC ("Recording Date"), TDRL ("Release Date")

https://xiph.org/vorbis/doc/v-comment.html  see specification for DATE: "Date the track was recorded"