Customize material for change default texture (flashes white blicking)

CesiumJS
1

Hey, everybody. I’m creating an Entity Plane and I’m adding
ImageMaterialProperty. When I update the position, the white background flashes. How can I access the original texture and change it?

cesium.viewer.entities.add({  
name: "Red plane with black outline",  
position: new Cesium.Cartesian3.fromDegrees(-107.0, 40.0, 300000.0), 
plane: {  
        plane: new Cesium.Plane(Cesium.Cartesian3.UNIT_Z, 0.0), 
         material: new Cesium.ImageMaterialProperty({ 
                        image: './logo512.png',
                        transparent: true, }),
          dimensions: new Cesium.Cartesian2(60000.0, 61000.0) 
    } 
});