subsequent-author-substitute not working for single field authors

Since upgrading my Zotero Standalone to I'm having problems with subsequent-author-substitute in my custom citation style.

It used to work for both single field and two field author names, but now it doesn't work for single field names.

When I switch over to the Chicago author-date style it works fine, so I guess it's a problem with my style, but I didn't have this issue before upgrading.

Would someone be able to take a look?

The bibliography code begins on line 306.

(Sorry I can't paste a gist, my work blocks github.)
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