I'm not aware of newly added regressions in the latest daily build (20221227), so that would be my first choice. I don't have any personal experience with Rockbox on the Nano though.
If you do run into an issue, you can always post about it on the Forums, IRC or the bug tracker (Flyspray), and there's a chance someone will be able to fix it (who would otherwise tell you to update to the latest build first...
)