HarmonyOS 鸿蒙Next build() 和 onDidBuild()的调用时机问题

private settings: RenderingContextSettings = new RenderingContextSettings(true)
private canvasContext2D: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)

@Component
export struct GuitarChordPage {
    build() {
        Column({ space: 25 }) {
            // Canvas START
            Canvas(this.canvasContext2D)
                .id('chordCanvas')
                .width(this.canvasWidth)
                .height(this.canvasHeight)
                .backgroundColor('#0798b3')
                .onReady(() => {
                // init初始背景
            })
        }.width('100%').align(Alignment.Center)
    }
    onDidBuild() {
        let ctx = this.canvasContext2D
        ctx.beginPath()
        ctx.fillStyle = '#ff00ff'
        ctx.arc(48, 88, RADIUS, START_ANGLE, END_ANGLE)
        ctx.fill()
        // 实际并没有画出这个圆，而我在另一个onClick事件中写了同样的代码就可以画出来
    }
}
开发环境：DevEco Studio NEXT Release(Build Version: 5.0.3.906)
  
运行环境：虚拟机 & 真机