I was really convinced that I set immediate email notifications for this thread, while weekly notifications were set, that should now be fixed.
As for the issue at hand, the plugin by default uses the attributes href, epub:textref and src to search for fragment identifiers, and the users can visualize and edit this list in the preferences of the plugin. So, DNSB, for your specific problem, you should be able to add 'aria-labelledby' to that list by clicking on the "Preferences" button after launching the plugin.
It would probably be better if the aria attributes were included in the search by default, I will look into it for a new release shortly.
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