NorFonts: you have solved my problem. Thank you very much. The music now prints all the custom accidentals in pdf and on paper. What did you do, if you can describe it in not too much detail, to regenerate the font in FontForge?
Previously I had found FF too difficult to use and used instead an inexpensive font creator for part of the font. (Before that, going back many years, I don’t remember what I used.) As I mentioned, the font worked in Dorico 2. But I am using Dorico 3 and am therefore glad to be able to resume work knowing that I can print the result.
Thanks also to everyone who considered my problem, including Daniel, of course, who seems to have been right that the font was a problem.