HarmonyOS 扩展安全区域当使用背景图片时没有效果

参考示例demo：

import window from '@ohos.window';
import { common } from '@kit.AbilityKit';
@Entry
@Component
struct Page1 {
  @State message: string = 'Hello World';
  context: common.UIAbilityContext = getContext(this) as common.UIAbilityContext
  async setSystemBar() {
    let windowClass = await window.getLastWindow(this.context)
    //设置状态栏不可见
    await windowClass.setWindowSystemBarEnable(['navigation'])
  }
  aboutToAppear() {
    this.setSystemBar()
  }
  build() {
    Row() {
      Text(this.message)
    }
    .height('100%')
    .width('100%')
    .backgroundImage($r('app.media.background'))
    .backgroundImageSize(ImageSize.Contain)
    .backgroundColor('#666')
    .backgroundImagePosition(Alignment.Bottom)
    .expandSafeArea([SafeAreaType.SYSTEM], [SafeAreaEdge.BOTTOM])
  }
}