[Koha] Link field authority

Good, I created a new field MARC 697 – local subjectc I also created a “local subjectc” authority type and then linked it to field MARC 697. I imported some records and authorities with the information into the appropriate fields. I ran the misc/link_bibs_to_authorities.pl script to link the authorities with the records information. Fields 650, 100, etc. were linked normally, but field 697 was not linked. Is this a bug in the system? Is Koha not linking newly created MARCS fields?