Zotero 7 inserting "by" into subsequent cites

I use legal Bluebook style, which calls for citing subsequent sources in footnotes as follows:

Jones, supra note 178, at 366.

Upon upgrading to Zotero 7, now the cites have "by," inserted, as follows:

Jones, by, supra note 178, at 366.

Does anyone know why this is happening? How can I fix it? It's going to cause a major problem for my draft if I can't get it sorted ASAP. I am comfortable editing the style if there's a fix.
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