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LM63635-Q1: The chip surface is damaged and has sharp edges

Part Number: LM63635-Q1

Tool/software:

the broken IC

Hi,
During the DV test, we find a unit broken with a unusual appearance (we have used thousands of this converters and that is the only one case).
We just turned on the power and enabled the LM63635 (12Vdc to 5Vdc) and we found it was broken.
You can see the appearance with a sharp edge, which not likes the molten state or has other abnormal color. and we also finded the lower side MOS (SW to GND)is shorted, and the high side is cutting off.
We have no idea about this situation. Could you please guide me on the analysis approach?