The situation described in the question is a common occurrence in project management known as scope creep, where additional features or functions are added to the project without changes to time, budget, or resources.
This can lead to projects overrunning their budget and schedule, and can reduce the value delivered to the client. The Project Management Professional (PMP) guidelines emphasize the importance of managing scope creep. In this case, the project manager should refocus the team on the agreed-upon features to ensure that the project delivers the expected value within the agreed time and budget. References: Project Management Professional (PMP) Certification Handbook from www.pmi.org and A Guide to the Project Management Body of Knowledge (PMBOK Guide) from www.pmi.org.