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I've found the cause of the problem now.
It was really puzzling at first because I am definitely using Epub 3 (have not used anything else for several years now) and the html references were present in all the html files.
The only thing I could find was that when Indesign exported the epub, the lang and xml:lang tags were missing. I have no idea why that has suddenly started to occur.
But I knew that access:aide added those tags, so I ran the plugin a second time. This time, with the lang tags having been added to the html files, all the ARIA roles showed up as expected.
MANY thanks for those tests, I would not have thought to run the plugin a second time without seeing your results.
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