Converter transfers only the first element of multi-value FLAC tags when converting to MP3

[danpla]

When a FLAC file has multiple track artists (i.e. several artist entries in Vorbis comments), the DDB tag editor correctly shows them all in "Artist Name", separated by a semicolon. However, when such a file converted to MP3, only the first artist name is transferred to ID3 tags, and the rest are discarded.

The same happens with any other multi-value Vorbis comment. For example, here are tags from a FLAC file:

metaflac --list --block-type=VORBIS_COMMENT *flac
METADATA block #2
  type: 4 (VORBIS_COMMENT)
  is last: false
  length: 622
  vendor string: reference libFLAC 1.3.0 20130526
  comments: 23
    comment[0]: title=Honor for All - End Credits
    comment[1]: album=Dishonored: Original Game Soundtrack
    comment[2]: albumartist=Various Artists
    comment[3]: artist=Various Artists
    comment[4]: artist=Daniel Licht
    comment[5]: artist=Jon Licht
    comment[6]: tracknumber=12
    comment[7]: discnumber=1
    comment[8]: totaltracks=13
    comment[9]: totaldiscs=1
    comment[10]: date=2012-10-09
    comment[11]: copyright=2012 Bethesda Softworks
    comment[12]: Rating=Clean
    comment[13]: isrc=QMTH31200012
    comment[14]: UPC=093155174986
    comment[15]: Label=Bethesda Softworks
    comment[16]: main_artist=Various Artists
    comment[17]: main_artist=Daniel Licht
    comment[18]: main_artist=Jon Licht
    comment[19]: composerlyricist=Daniel Licht
    comment[20]: composerlyricist=Jon Licht
    comment[21]: author=Daniel Licht
    comment[22]: author=Jon Licht

And here are the tags from the converted MP3 (note that only the first artist, main_artist, composerlyricist and author is transferred):

Information about the software:

Deadbeef version: 1.9.6
OS: Linux, Ubuntu 24.04