OK - I've figured out something more.
This problem does not occur when exporting from a single InDesign document - (at least, the CSS rule for the object style is still not created, but at least I'm not getting the duplicate rules)
But it does happen when exporting an InDesign book document - and I think the problem is because although the styles are defined in the document that is used as the style source, the actual objects that the styles are applied to, are only in later documents.
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