Seeing this in 3.8.5 and Master. When I do a search for isbn: 0310240417 on LOC via Z39.50 in cataloging, I get no results, but when I search on the LOC site I find it. Other LOC searches do work, so it's not that LOC is down. Also the same thing happens when I try to search other library catalogs using Z39.50 for ISBN.
seems to have been a blip