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TPS65910A3 VDD1 and VDD2 registers

I am using the TPS65910A3 as used on the AM335x Starter kit.

I noticed I can read and write VDD1_REG and everything reads back the same thing I have written.

I can also write to VDD1_OP_REG without errors but I noticed when I read it back it is always 0x00 no matter what I have written.

Why is VDD1_OP_REG read different?