When Polygon is translucent fill and height is 0 it will cover the billboard

CesiumJS
1

polygon entity options

polygon:{
    height:0,
    hierarchy: {
        // 添加外部区域为1/4半圆，设置为180会报错
        positions:positions,
        // 中心挖空的“洞”
        holes:item.children.map(v=>({positions:degreesToCartesian3(v.positionsOrigion)}))
    },
    material:Cesium.Color.fromCssColorString('rgba(64,253,255,0.2)'),
    outline: true,
    outlineColor: Cesium.Color.fromCssColorString('rgb(64,253,255)'),
    outlineWidth: 2,
    zIndex:11,
}

billboard entity options

billboard：{
 image: image,
 verticalOrigin: Cesium.VerticalOrigin.TOP,
  width: 25.5,
  height: 29,
  eyeOffset: new Cesium.Cartesian3(0, 0, -0.9),//指定像素偏移量 Cartesian3. 负数 高度往上
}

effect picture

image
when height is undefined

image