MARC Export Missing Custom Call Numbers

1. Go to https://www.librarything.com/catalog/SHC_Library/musiccds and make sure you're viewing a display Style with "Other call number system". See all but 1 record have a custom call number.
2. In the user's account, go to https://www.librarything.com/export.php?export_type=marc and export a filtered set of their Music CDs Collection (480 records in total).
3. Using MarcBreaker, inspect the readable file.

Bug: The Export is missing their custom call numbers, when the documentation says it should be including them: https://wiki.librarything.com/index.php/HelpThing:MARC_export (field 952$o).

Sorry, this is kristilabrie, still testing.

NB I used the following (default) settings:
- Use existing library records, when available
- Fuzzy matching (finds the “best” matching library record based on title, publication, etc.)
- Integrate your catalog changes into library records (supplement your data with data from library records)

That might be it, but I'm double checking now.

Update: I thought the issue might be that the user had DDC set as their Call number system at https://www.librarything.com/settings/other; I changed it (briefly) to "Personal or custom system" and reran the MARC Export, but only DDC call numbers were still showing in the 952$o field. Not what's actually in their "Other call number system" field.