After getting all my key note symbols in, when changing to "by sheet", none of the descriptions show. The key note numbers show correctly.
I played with the file. It did have a couple of lines that got enclosed with quotes but they didn't seem to have any affect. I even replaced the file with a pared down version of one of the OOTB files and it behaved the same way. I'm thinking I did something wrong in the model as I was experimenting.
Someone mentioned user keynotes may have an effect, but, as far as I can tell, when a user keynote is added to an element, the element properties are not changed in any way. At least, I can't see any reference to the user keynote(s).
I can let the project go out with them set to "By keynote" (not by project as I stated earlier). I'm thinking that is a better way but I can also see the list getting too long to have the entire thing on every plan.