S is declarer in 4♠, with the lead in dummy. The next trick goes ♣9-Q-2-6. My recollection is that declarer has lost 2 tricks so far.
At this stage, dummy quits the ♠T instead of the ♣9. E leads the ♣3, and declarer then says "Hey, where's dummy's spade?" A director call rapidly follows, and the players report:
S: "I had led the ♣9 from dummy, losing to the Q; the ♣3 was then led and I noticed that dummy's remaining trump had vanished".
E: "I only led the ♣3 because there was the 9 on table!"
N and W are mostly silent, but the facts are agreed. What is your ruling?