ADM2867EBRNZ requires FB on ISO_Ground?

Hi. The ADM2867EBRNZ and series of new isolated rs485 xcvrs is of interest to us. In the review of the ref schematic, there is a recommendation for a FB in series with the ISO_GROUND pin. Is this required? The EVAL BOARD for this component does not contain the same FB on GND2. Just wish to design with the best solution. Thanks.

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