HarmonyOS slider绑定滑动手势，手势回调里的event.fingerList数组长度是2，但是第一个元素是null，导致应用crash

相关代码

@Entry
@Component
export struct List0FailComponent {
  @State redVisibility: Visibility = Visibility.None
  build() {
    Column() {
      Text("slider")
        .gesture(LongPressGesture({ fingers: 1, repeat: false, duration: 500 })
          .onAction((event) => {
            this.redVisibility = (this.redVisibility == Visibility.Visible) ? Visibility.None : Visibility.Visible
          })
          .onActionEnd(() => {
            this.redVisibility = (this.redVisibility == Visibility.Visible) ? Visibility.None : Visibility.Visible
          }))
      Stack() {
        Slider({
          min: 0,
          max: 100
        })
          .gesture(PanGesture()
            .onActionStart((event) => {
              console.log('--- ' + JSON.stringify(event.fingerList));
              let x = event.fingerList[0].localX
            }))
          .width('100%')
          .height(100)
        Stack()
          .width('100%')
          .height(100)
          .backgroundColor('red')
          .visibility(this.redVisibility)
      }
      .margin({ top: 200})
    }
  }
}

问题复现手段

通过两个手指来操作，一个手指长按“slider”文本，待红色stack快要盖住slider之前，另一个手指滑动slider。可能有点不好复现，比较考验手速！

app直接crash，日志如下

Error message:Cannot read property localX of undefined
SourceCode:
  let x = event.fingerList[0].localX;
^
Stacktrace:
  at anonymous (entry/src/main/ets/pages/ListTest.ets:31:23)

通过打印日志，可以看到event.fingerList的结构是这样的

[null,{"id":1,"globalX":66.39462984525241, ...]