ArtK78, on 2013-April-26, 10:47, said:
[It might be a stretch to say that inadvertently concealing one of dummy's cards when the dummy was spread is an irregularity, in that all of the players can view the dummy and determine for themselves if all of the cards are there. But you may very well be right that the ruling might go this way. I have certainly never seen it.
It's not a stretch at all. I've never had occasion to rule on this particular irregularity, but if I do, that's the way it'll go.