Zotero detects metadata but does not download PDF

For articles from this journal (and possibly other De Gruyter journals):
https://www.degruyter.com/view/j/cogl.2016.27.issue-4/cog-2016-0004/cog-2016-0004.xml?format=INT

I have institutional access, and Zotero detects the metadata using the DeGruyter translator, but it doesn't attach the PDF. Why?
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