List组件的initialIndex属性设置不生效

// xxx.ets 
@Entry 
@Component 
struct ListExample { 
  arr: string[] = ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12']; 
 
  build() { 
    Column() { 
      Scroll() { 
        List({ initialIndex: 5 }) { 
          ForEach(this.arr, (item: string) => { 
            ListItem(item) { 
              Row() { 
                Text(item) 
                  .fontColor(Color.Red) 
                  .fontSize(40) 
              } 
            } 
            .width('100%') 
            .height(100) //此处若未设置List高度，则initialIndex属性不生效 
            .border({ 
              width: 1, 
              color: Color.Black, 
              radius: 5 
            }) 
          }) 
        } 
        .height(400) 
        .alignListItem(ListItemAlign.Center) 
      } 
    } 
    .padding({ top: 10 }) 
  } 
}