@Dchiplin - in and of itself a jacket is not metadata; it's a regular 'page' whose content is derived from the metadata, which probably explains why Embed Metadata and Kobo Utility "update metadata in device library" don't update jackets.
FWIW - I use the Modify PI to refresh jackets in EPUBs. I use Modify rather than Polish because I also remove the cover and non-dc metadata elements.
BR
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