I would suggest you to keep 'Global Material Enviornment' as Vaccum. It is not possible to use floquet ports/lattice pairs with half dielectric space. I suggest you to create a single full size box and assign material as 'Air'. You can assign lattice pairs and floquete ports to this 'Air' box. Now to create a interface of two different medium (Air and Water), insert two boxes having size half of the earlier created 'Air' box. Assign this boxes 'Air' and 'Water' medium respectively. Intersection errors if any, you can override by using options HFSS > Design Settings > Validations > Enable material override.
Could you please check results with this method ? Thanks.
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