I think what "widely held belief" has itself thinking is Law 50B3:
The penalty for an established revoke does not apply:...if the revoke was made in failing to play any card faced on the table or belonging to a hand faced on the table, including a card from dummy's hand.
Which is certainly true, and saved me from 3
-2 when +150 was obvious (the hidden card was a trump...pulling the "outstanding trump" cost me the overtricks). However, that does not make anything any of the other posters said invalid! L50C goes on to say (my emphasis):
When, after any established revoke, including those not subject to penalty, the Director deems that the non-offending side is insufficiently compensated by this Law for the damage caused, he shall assign an adjusted score.
So, if dummy doesn't put the hand correctly, and this causes a problem to the opponents, the score will be adjusted. It's only when dummy revokes because of misalignment, and either nobody was hurt or the only side hurt is dummy's, is there no additional penalty.
Michael (who had to give an established revoke penalty last night...for 2NT-6).
Calgary AB Canada