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OPT3004: GND Pad is not connected to the PCB Ground

Part Number: OPT3004

dear 

   OP3004 center GND Pad is not connected to the PCB Ground, whether it will affect the normal operation of the chip, the chip will have an impact on other performace parameters?any design risk?

it can not find any influence in cerrent test while GND Pad is not connected to the PCB Ground

    any advise?thanks in advance