It so happens that only a precious few generators are recognized for parsing blog-post entries into Zotero, that is:

1<meta name=generator content="Wordpress">
2<!-- or  -->
3<meta name=generator content="Blogger">
4<!-- or  -->
5<meta name=generator content="Wooframework">

This is really rather silly to put on say, a hugo generated site, but since the embedded metadata-parsing is so much better, it kind of makes sense to do so as a stop gap solution.

The code which handles these meta tags for blogPosts can be seen upstream. Will be fixed by this PR soon enough hopefully.