East was dealer, EW vul. The auction was as follows:
1D-1H-pass-1S
2C-pass*-2D-2H
3D-pass*-pass-3H-
all pass
South broke tempo twice during the auction (agreed by South, East, and West; North stated that his mind was elsewhere and didn't notice). The lead was the diamond 3; result was +140 for NS, obviously not good for EW with 11 tricks available in diamonds. Whodunnit?

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