BoundingSphere.fromOrientedBoundingBox is incorrect

[hpinkos]

var viewer = new Cesium.Viewer('cesiumContainer');
var center = new Cesium.Cartesian3(4887501.122078268, 786198.1296201526, 4008900.532512873);
var halfAxis = new Cesium.Matrix3(-127.27149886828649, -680.2575869826898,58.31047687474563,
                                  792.6634927382382, -109.22340123515842,9.362436720703323,
                                  0,844.0437859967432,48.20690839996962);
var obb = new Cesium.OrientedBoundingBox(center, halfAxis);
var bs = Cesium.BoundingSphere.fromOrientedBoundingBox(obb);

var radius = bs.radius;
var geometry = Cesium.GeometryPipeline.toWireframe(Cesium.EllipsoidGeometry.createGeometry(new Cesium.EllipsoidGeometry({
    radii : new Cesium.Cartesian3(radius, radius, radius),
    vertexFormat : Cesium.PerInstanceColorAppearance.FLAT_VERTEX_FORMAT
})));

viewer.scene.primitives.add(new Cesium.Primitive({
    geometryInstances : new Cesium.GeometryInstance({
        geometry : geometry,
        modelMatrix : Cesium.Matrix4.fromTranslation(bs.center),
        attributes : {
            color : new Cesium.ColorGeometryInstanceAttribute(1.0, 0.0, 0.0, 1.0)
        }
    }),
    appearance : new Cesium.PerInstanceColorAppearance({
        flat : true,
        translucent : false
    }),
    asynchronous : false
}));

geometry = Cesium.GeometryPipeline.toWireframe(Cesium.BoxGeometry.createGeometry(Cesium.BoxGeometry.fromDimensions({
    dimensions : new Cesium.Cartesian3(2.0, 2.0, 2.0),
    vertexFormat : Cesium.PerInstanceColorAppearance.FLAT_VERTEX_FORMAT
})));

viewer.scene.primitives.add(new Cesium.Primitive({
    geometryInstances : new Cesium.GeometryInstance({
        geometry : geometry,
        modelMatrix : Cesium.Matrix4.fromRotationTranslation(obb.halfAxes, obb.center, new Cesium.Matrix4()),
        attributes : {
            color : new Cesium.ColorGeometryInstanceAttribute(1.0, 0.0, 1.0, 1.0)
        }
    }),
    appearance : new Cesium.PerInstanceColorAppearance({
        flat : true,
        translucent : false
    }),
    asynchronous : false
}));

viewer.camera.flyToBoundingSphere(bs, {
    duration: 0,
    offset: new Cesium.HeadingPitchRange(0, -Cesium.Math.PI_OVER_TWO, 5000)
});