HarmonyOS 鸿蒙Next ListItemGroup会影响到onScrollIndex事件的监听嘛？

HarmonyOS 鸿蒙Next ListItemGroup会影响到onScrollIndex事件的监听嘛？

有问题的代码如下，使用ListItemGroup就监听不到onScrollIndex事件中起始位置和终止位置的变化，上滑的时候，顶部的0-0一直没变～

@Entry
@Component
struct TestPage {
  private nums: number[] = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19]
  @State startIndex: number = 0
  @State endIndex: number = 0

  @Builder
  headerList() {
    Row() {
      Text('ListItemGroup的顶部')
      Text(`${this.startIndex} - ${this.endIndex}`)
    }.width('100%').height(70).justifyContent(FlexAlign.Center).backgroundColor(Color.Orange)
  }

  build() {
    List() {
      ListItemGroup({ header: this.headerList() }) {
        ForEach(this.nums, (item: number) => {
          ListItem() {
            Column() {
              Text(item.toString()).width('100%').height(100).textAlign(TextAlign.Center).align(Alignment.Center)
              Divider().width('100%').height(1).color(Color.Black)
            }
          }
        })
      }
    }
    .width('100%')
    .height('100%')
    .sticky(StickyStyle.Header)
    .onScrollIndex((start: number, end: number) => {
      this.startIndex = start
      this.endIndex = end
    })
  }
}

把ListItemGroup去掉，就可以正常监听到onScrollIndex中的变化，顶部的0-0会随着滑动而改变？这是咋回事～可以帮我看看嘛？

@Entry
@Component
struct TestPage {
  private nums: number[] = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19]
  @State startIndex: number = 0
  @State endIndex: number = 0

  @Builder
  headerList() {
    Row() {
      Text('ListItemGroup的顶部')
      Text(`${this.startIndex} - ${this.endIndex}`)
    }.width('100%').height(70).justifyContent(FlexAlign.Center).backgroundColor(Color.Orange)
  }

  build() {
    Column() {
      Row() {
        Text('ListItemGroup的顶部')
        Text(`${this.startIndex} - ${this.endIndex}`)
      }.width('100%').height(70).justifyContent(FlexAlign.Center).backgroundColor(Color.Orange)

      List() {
        ForEach(this.nums, (item: number) => {
          ListItem() {
            Column() {
              Text(item.toString()).width('100%').height(100).textAlign(TextAlign.Center).align(Alignment.Center)
              Divider().width('100%').height(1).color(Color.Black)
            }
          }
        })
      }

      .width('100%')
      .height('100%')
      .sticky(StickyStyle.Header)
      .onScrollIndex((start: number, end: number) => {
        this.startIndex = start
        this.endIndex = end
      })
    }
  }
}