The person who finds the missing detail has contributed to the result, not interrupted it.

Catching a missing piece feels like an interruption because of when it lands. Everyone was moving, the thing looked settled, and now there is a stop. The stop is the contribution, since without it the same problem arrives later and more expensively. How that moment is received decides whether they speak up next time.

When someone spots a gap, put it in the record of the work as a contribution rather than a delay. Say thank you in front of the others involved. Then look at why the gap survived until then, which is more useful than looking at who paused things.