Campaign scope grows during production. The useful response is a targeted correction with an observable acceptance check. That keeps the repair tied to the problem instead of turning it into an open-ended redesign.
Find the likely cause
New deliverables enter without changing time or ownership.
Treat this as an explanation to verify against the actual work. Look at the input, the relevant decision, and the final result together. If the evidence does not support this diagnosis, investigate the mismatch before applying a convenient but unrelated fix.
Make the targeted correction
Maintain a deliverable list with an explicit approval step for additions.
A campaign brief should make decisions easier by defining the audience, promise, evidence, action, and constraints.
Check that the repair worked
Confirm that every asset has a purpose, owner, and deadline.
Repeat the check on the final version that the reader or customer will encounter. An approved draft, a preview, and a published result can differ; the acceptance decision should concern the version people actually use.
Prevent the next related failure
A separate issue to watch for is this: a brief includes conflicting brand instructions. Resolve conflicts in the brief before requesting another draft.
Monitor the useful outcome
Track revision rounds and the percentage of deliverables accepted against the brief on first review.
Keep a short record of the original symptom, the evidence behind the diagnosis, and the result of the acceptance check. That record makes the solution reusable when the same condition appears again, without assuming that every superficially similar problem has the same cause.