HarmonyOS鸿蒙Next中@Builder无法在@Reusable组件中使用

import { ListItemDataSource } from "../../components/lazylist/Model";

interface ListItemData {
  id: string; // 唯一标识，可用于埋点
  layout: string; // 布局类型标识
  data: Object; // 实际的数据
}

[@Builder](/user/Builder)
function txt1Builder(item: ListItemData) {
  Column() {
    Text(item.data.toString())
  }
  .backgroundColor(Color.Green)
  .width('100%')
  .height(60)
}

[@Builder](/user/Builder)
function txt2Builder(item: ListItemData) {
  Column() {
    Text(item.data.toString())
  }
  .backgroundColor(Color.Red)
  .width('100%')
  .height(100)
}

@Entry
@Component
export struct MinePage {
  @State
  private dataSource: ListItemDataSource = new ListItemDataSource();

  aboutToAppear(): void {
    const list: ListItemData[] = [];
    for (let i = 0; i < 50; i++) {
      const layout = Math.random() > 0.5 ? 'txt1' : 'txt2';
      list.push({id: `${i}`, layout, data: `${layout} ${i}`});
    }

    this.dataSource.addAll(list);
  }

  build() {
    Column() {
      List({space: 4}) {
        LazyForEach(this.dataSource, (item: ListItemData, index: number) => {
          ListItem() {
            ReusableListItem({ item }).reuseId(item.layout)
          }
        }, (item: ListItemData, index: number) => item.id ?? `${index}`)
      }
        .width('100%')
        .height(0)
        .layoutWeight(1)
    }
    .width('100%')
    .height('100%')
  }
}

[@Reusable](/user/Reusable)
@Component
export struct ReusableListItem {
  @Prop item: ListItemData;

  aboutToReuse(params: Record<string, Object>): void {
    const item = params.item as ListItemData ?? this.item;
    this.item = { id: item.id, layout: item.layout, data: item.data };
  }

  build() {
    if (this.item.layout == 'txt1') {
      txt1Builder(this.item);
    } else {
      txt2Builder(this.item);
    }
  }
}

为什么ReusableListItem传入builder（如txt1Builder），会导致页面列表元素复用错乱（怀疑是界面未实际刷新）。但改成下面这种，则可以正确复用：

[@Reusable](/user/Reusable)
@Component
export struct ReusableListItem {
  @Prop item: ListItemData;

  aboutToReuse(params: Record<string, Object>): void {
    const item = params.item as ListItemData ?? this.item;
    this.item = { id: item.id, layout: item.layout, data: item.data };
  }

  build() {
    if (this.item.layout == 'txt1') {
      Column() {
        Text(this.item.data.toString())
      }
      .backgroundColor(Color.Green)
      .width('100%')
      .height(60)
      // txt1Builder(this.item);
    } else {
      Column() {
        Text(this.item.data.toString())
      }
      .backgroundColor(Color.Red)
      .width('100%')
      .height(100)
      // txt2Builder(this.item);
    }
  }
}