A correction lands better when the standard was clear before the mistake.

Correction after an unstated rule feels like a trap, because it is one. The person hears not only that they got it wrong but that the target was invisible, which turns a work problem into a fairness problem. Their attention goes to defending themselves instead of fixing the thing. Standards said in advance are boring to state and cheap to keep.

Before someone starts a task, say what a good version looks like, including the parts you think are obvious. If you find yourself about to correct something you never specified, say that first, then ask for the change. It costs one sentence and saves the relationship a bruise.