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MSFS Datum Type for Structs?

I see that some SimVars, e.g. STRUCT LATLONALTPBH return data that doesn't map to one of the SIMCONNECT_DATATYPE's. This SimVar for example says it returns a struct of 6 float64 values. In this case does anyone know what we're supposed to provide for the DatumType in the SimConnect_AddToDataDefinition call? I've tried everything I can think of and I don't get any errors, just am not receiving the data back correctly.

SIMCONNECT_DATATYPE.LATLONALT. If it doesn't work then suspect the MSFS SDK as being faulty because it very definately works in P3D.
Ok seems like it's a bug in MSFS SDK then. I can call STRUCT LATLONALT with SIMCONNECT_DATATYPE_LATLONALT and it works fine, but if I try to use it with STRUCT LATLONALTPBH then it fails. What's strange is it doesn't return any exceptions - just doesn't return the data. MSFS SimConnect truly is a beast to try and work with.