[LayaAir3]sprite再次加入父对象滤镜渲染失效

let ctn = new Laya.Sprite();

Laya.stage.addChild(ctn);



let drawSp = new Laya.Sprite();

drawSp.graphics.drawRect(0, 0, 100, 100, `#ffcc00`);



drawSp.x = 200;

drawSp.y = 200;



//由 20 个项目（排列成 4 x 5 矩阵）组成的数组，灰图

var grayscaleMat: any[] = [0.3086, 0.6094, 0.0820, 0, 0,

    0.3086, 0.6094, 0.0820, 0, 0,

    0.3086, 0.6094, 0.0820, 0, 0,

    0, 0, 0, 1, 0];



//创建一个颜色滤镜对象，灰图

var grayscaleFilter: Laya.ColorFilter = new Laya.ColorFilter(grayscaleMat);



// 灰度猩猩

drawSp.filters = [grayscaleFilter];



ctn.addChild(drawSp);



setTimeout(() => {

    //以下两种方式置灰滤镜会失效

    ctn.addChild(drawSp);

    ctn.setChildIndex(drawSp, 1);

}, 1000);