during uat, the user realizes a major missing functionality that should be included in the system. this is not related to the implementation of the application, but with the design and the initial laid out initial requirements.
if you push the current state to production, the app will appear unusable since it is missing a key functionality (that the customer didn't included in the requirements earlier).
you can also continue to develop but this will extend the timeline for the accomplishment of the app. and it would appear that the developers are behind schedule.
how do I proceed with this one?