Potential bug with explicitPorositySource when using a cylindrical reference system

I have recently updated a model developed with the v1606 to the latest v2012 release and found an issue.

The model features a region consisting of four several cell zones where the explicitPorositySource is used to apply a pressure drop as well as allow the flow to move perpendicularly through the zones only.

Since some of the zones are curved, a local cylindrical reference system is used to apply a finite porosity coefficient in the radial direction only.

In the v1606 (first picture attached) everything works fine but the same settings in the v2012 lead to correct behavior in the straight regions but not in the curved ones.

I've been looking in the documentation and it looks like the syntax for the reference system did not change, so I'm wondering if this could be an actual bug.

Syntax:

coilPackageSouthWestPorosity
{
    type            explicitPorositySource;
    active          yes;

    explicitPorositySourceCoeffs
    {
        selectionMode   cellZone;
        cellZone        coilPackageSouthWest;

        type            DarcyForchheimer;

        DarcyForchheimerCoeffs
        {
            f   (0 -1000 -1000);
            d   (2.209e+07 -1000 -1000);

            coordinateSystem
            {
                type    cartesian;
                origin  (-0.375 -0.05 0);

                coordinateRotation
                {
                    type    cylindrical;
                    e3      (0 0 1);
                }
            }
        }
    }
}