The term "matters arising" is just too vague for a decision to be taken if needed. Agree with MrsAbster that if a further decision is needed, it should be a separate agenda item. If it is just a report on progress, it can be a separate "for information" item or in some cases the Clerk provides a report on outstanding items (often termed "Clerk's Report") to provide an update.
To go back to the original question, the resolution to exclude the press and public implies the next agenda item (or items) are to be heard in confidential session in which case the agenda item might be a little vague (e.g. the term staffing matters might be used to imply a personnel related issue) but supporting confidential papers for councillors only might be more specific about the nature of the item to be discussed.