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No change.

So I deleted site cookies and data. No change.

So I emptied browser cache and retried. Now the button label is Done and press works as expected.

Thank you for your time and effort. The browser cache can really drive one nuts. I assumed that the URL parameter would force a new request.

Perhaps the page Expires is worth checking.

That was stupid of me - I should have also added a URL parameter to the embedded pages.