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LM5050-1: - 1.2KV differential mode surge damaged pin1,2

Part Number: LM5050-1
Other Parts Discussed in Thread: LM5050-2

Hi experts,

My customer is using LM5050-1 for a swithing products. when they were doing  negative 1.2KV differential mode surge test, Pin1,2 of LM5051-1 was damaged.   below is their schematic,the surge  was input between 54V1_PG and GND_PG. please kindly suggest if somethingd could do to improve this . thanks.