[pescetom]

South is doing her best in 3♥X after a bidding mishap.
West who doubled already covered the T with Q, almost certainly has the A but might not have J.
South looking at K52 in hand plays 9 from 98 in dummy, East plays 3 in tempo, South plays low and prays: no luck, West confidently covers and leads A.
South sighs and looks at dummy, but North (who has not quitted his card) quickly interjects "you won the trick in dummy, and that Ace is a penalty card".
The quitted cards are inspected, West did indeed play 7 even though he had obviously decided to play J, as he explains.
West calls Director and explains the above: how do you proceed?

[smerriman]

It doesn't matter what he intended to play.

Quote

47 F 2. Except as this Law specifies, a card once played may not be withdrawn.

None of the other aspects of law 47 apply to the play of the 7, so that stands and the A is a lead out of turn.

Of course, then you have the issue that dummy isn't allowed to draw attention to this.. but 43B3 doesn't apply because of the silly restriction to A2 only, so dummy is liable to be penalized, but the rest proceeds as per a standard lead out of turn, as far as I can tell anyway.

[pescetom]

And if South told you clearly "I was convinced like West that he had played the Jack before leading the Ace and I was about to call hearts from dummy." ?

[smerriman]

That's why the restriction of 43B3 to A2 only is silly; it seems more logical to say play should continue after any breach from dummy.

But it appears that as written, even though dummy wasn't allowed to bring attention to it, the result is attention gets brought to it. And dummy's PP is the only way to compensate..