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AM5728: GP EVM clamp circuits

Part Number: AM5728

Hi, I'm going through AM572x EVM schematic(version CM_C1 LM_A2a PM_A3a) for our product development reference. I noticed below circuit between VDD_SHV5 , VDD_3V3 and VDD_1V8. It looks to me the circuit intention is for stablizing voltage between 2 power rails, but I am not quite sure how it is working, could you explain in detail? And why  R430, R429 is DNI? 

I am also curious to know  what  issue is TI concerned about or already found so add this circuit on EVM board?Does this circuit is a must for customer AM572x based board? 

Thanks.