New American Meteorological Society style
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And are you sure the authors that _don't_ get replaced by "true" are actually entered exactly the same way in Zotero?
So it appears that the ones listed as "true" are identical. The ones spelled out are slightly different (sometimes just a period or not on the middle initial).
subsequent-author-substitute="true"
to
subsequent-author-substitute="——"
and it appears to work now. I made the change in github, so it should show up soon.