Could be they composed the cadenzas, but not a good way to display the information.
That could easily be, although I think “composer” is the wrong tag for that. I wonder what it shows when you click on track credits.
They could also conceivably be composer file tags.
and your recommendation is?
My comment was reported to the way to expose the data in tracks (first post). The composer in this case is just and absolutely Beethoven, cadence and / or the arrangement should be listed separately.