S2Cell#getVertex() returns implausible results

Hi there,

while making myself familiar with this great library I was trying to convert an S2Cell into a WKT Polygon using its four vertices. As it turned out, the values of all four vertices are identical with any of my test cells. Here is an example:

1011111111100000000000000000000000000000000000000000000000000000
[Lo=(-1.5707963267948966, -3.141592653589793), Hi=(-0.6154797086703869, 3.141592653589793)]
V0: (-35.264389682754654, -135.0)
V1: (-35.264389682754654, -135.0)
V2: (-35.264389682754654, -135.0)
V3: (-35.264389682754654, -135.0)

This is the code I am using:

private static String toWKTPolygon(final S2Cell cell){
    String wkt = new String("POLYGON((");
    S2LatLng point;

    System.out.println(cell.toString());
    System.out.println(toBinaryString(cell.id().id()));
    System.out.println(cell.getRectBound().toString());

    // vertex order in S2LatLng is CCW, thus compliant with vertex order in WKT
    for (int i=0; i<4; i++){
        System.out.println("V" + i + ": " + cell.getVertex(i).toDegreesString());
        point = new S2LatLng(cell.getVertex(i));
        wkt = wkt.concat(point.lngDegrees() + " " + point.latDegrees() + ",");
    }

    // close the poly loop
    point = new S2LatLng(cell.getVertex(0));
    wkt = wkt.concat(point.lngDegrees() + " " + point.latDegrees() + "))");
    return wkt;
}

If this is not a bug, how would I obtain the "natural" vertices of an S2Cell?

google / s2-geometry-library-java

S2Cell#getVertex() returns implausible results #4