The general belief is that the departure on the day was 2.5 hours delayed from plan because President Macron had switched round his commitments without discussion. Presumably this was just him acting out the part of his predecessor, De Gaulle, on the day, who made himself a complete nuisance both during the organisation and during the event, to the extent that Churchill had to arrange the French resistance signals to be covertly intercepted and translated, to see what he was doing, while Roosevelt (and thus Eisenhower) eventually refused to have anything further to do with him.