HarmonyOS 图片缓存需要多长时间，为啥加了setImageRawDataCacheSize依旧没有缓存图片

下面的demo代码在运行时，抓包发现依旧会下载两次图片，请问为啥图片设置了缓存没有生效

demo：

import app, { AppResponse } from '@system.app'

@Entry
@Component
struct Index {
  @State message: string = 'Hello World';
  @State hasComplete: boolean = true;
  @State imageUrl: string = ""
  @State imageShow : boolean = false

  onPageShow() {
    // 设置解码前图片数据内存缓存上限为100MB (100MB=100*1024*1024B=104857600B)
    app.setImageRawDataCacheSize(104857600)
    console.info('Application onPageShow')
  }

  build() {
    Stack({alignContent: Alignment.Top}) {
      if (this.hasComplete) {
        Image(this.imageUrl)
          .width(500)
          .height(150)
          .margin(100)
          .onComplete(mes => {
            this.imageShow = true
          })
      }
      Image("https://***.com/th?id=OHR.FireWave_ZH-CN7110736577_1920x1200.jpg")
        .width(200)
        .height(150)
        .margin(15)
        .onComplete(msg => {
          this.hasComplete = true
          this.imageUrl = "https://***.com/th?id=OHR.FireWave_ZH-CN7110736577_1920x1200.jpg"
        })
        .visibility(this.imageShow ? Visibility.Visible : Visibility.Hidden)
    }
  }
}