【报Bug】自定义组件中使用canvasGetImageData方法,无法返回结果,"canvasGetImageData:fail fail canvas is empty"

示例代码：

<canvas :canvas-id="cid" :id="cid"       disable-scroll="true" type="2d"></canvas>  
wx.canvasGetImageData({  
                    canvasId: this.cid,  
                    canvas: this.canvas,  
                    x: 0,  
                    y: 0,  
                    width: 1,  
                    height: 1,  
                    success(res) {  
                        console.log("wx.canvasGetImageData",res)  
                    },  
                    fail(e) {  
                        console.log("wx.canvasGetImageData",e)  
                    }  
                }, this.$mp.component)  
                //读取画板对应位置的点信息  
                uni.canvasGetImageData({  
                  canvasId: this.cid,  
                  x: point.x,  
                  y: point.y,  
                  width: 1,  
                  height: 1,  

                },this).then(res => console.log('res: this.$mp.component', res))

操作步骤：

canvas的 type="2d",初始化好canvas后,获取第一个像素点
找到相关帖子微信原生小程序是可以的
https://developers.weixin.qq.com/community/develop/doc/0004e67e5d4bc001e538809d556400?highLine=fail%2520canvas%2520is%2520empty
https://developers.weixin.qq.com/s/I5vZ4OmX7v68

预期结果：

wx.canvasGetImageData{height: 272, width: 375, data: Uint8ClampedArray(408000), errMsg: "canvasGetImageData:ok"}

实际结果：

wx.canvasGetImageData {errMsg: "canvasGetImageData:fail fail canvas is empty"}