It would help if we had an example of such a document to investigate.

@BR001: If you are the BR001 who opened this issue, would you be able to provide details on the current status of this issue?

@jcsteh: I remember you tackled another XFA pdf issue in the recent past. Do you have the chance to check this one?

I just tested an XFA PDF with both a combo box and a list box (though I don't know how these are mapped internally). While the selected item wasn't rendered in browse mode, I wasn't seeing any id either, and I was seeing the display text in focus mode. It's difficult to know exactly what I'm looking for without a test case and exact steps and we can't contact the reporter, so closing.