HarmonyOS TextTimer组件放到列表里面不起作用

参考示例如下：

@Entry
@Component
struct TextTimerExample {
  textTimerController: TextTimerController = new TextTimerController()
  @State format: string = 'mm:ss.SS'

  build() {
    Row() {
      List() {
        ListItem() {
          TextTimer({ isCountDown: true, count: 30000, controller: this.textTimerController })
            .onAppear(() => {
              this.textTimerController.start()
            })
            .format(this.format)
            .fontColor(Color.Black)
            .fontSize(50)
            .onTimer((utc: number, elapsedTime: number) => {
              console.info('textTimer notCountDown utc is：' + utc + ', elapsedTime: ' + elapsedTime)
            })
        }
      }
    }
  }
}