Worldcat ISBN matching not working (LoC works fine)

edited March 17, 2020
I have some books I would like to add to Zotero that appear in Worldcat but not Library of Congress. My understanding is that Zotero is supposed to check against both databases, so this shouldn't be a problem. Here are a few examples:

http://www.worldcat.org/oclc/875896857
http://www.worldcat.org/oclc/922998795
http://www.worldcat.org/oclc/1107357409

However, anytime I try to copy-paste any of the stated ISBNs from those pages into Zotero's lookup field, I'm told the entry can't be found. When I do the same thing with an entry from LoC, it works just fine.

I'm on Ubuntu 19.10 using Zotero 5.0.84, both currently the latest released versions.
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