Hello. While it is explicitly stated in the scrum guide that only the development team works on the product increment, there's the last sentence in the "Development Team Size" section where it says: "The Product Owner and Scrum Master roles are not included in this count unless they are also executing the work of the Sprint Backlog." Given this, can the SM or PO also work on ths items in the sprint backlog?
Hoping for some enlightenment in this :)