why is image as texture on ellipsoid transparent ?

Hello - im relatively new at cesium

tried to put an texture instead a color on ellipsoid.

it works but i get a transparency why ?

var imagespereMaterial3 = new Cesium.ImageMaterialProperty({

image:‘color3.jpg’,

});

entities.add({

id : seriesName + ’ sphere ’ + i.toString(),

position : heightPosition,

ellipsoid : {

radii : new Cesium.Cartesian3(sphereRadius, sphereRadius, sphereRadius*2),

outline : false,

fill: true,

minimumRadius :100,

material : imagespereMaterial3

}

});

Hello,

This is a known bug. We have an issue to fix it here: https://github.com/AnalyticalGraphicsInc/cesium/issues/2871

Best,

Hannah