HarmonyOS h5返回上一页面时会闪一下

import web_webview from '@ohos.web.webview' 
import business_error from '@ohos.base' 
@Entry 
@Component 
struct WebComponent { 
  controller: web_webview.WebviewController = new web_webview.WebviewController() 
  @State userAgent:string = 'Mozilla/5.0 (Phone; OpenHarmony 4.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36 ArkWeb/4.1.6.1 Mobile automobile/792 HuaweiBrowser' 
  build() { 
    Column() { 
      Web({ src: '', controller: this.controller }) 
        .onControllerAttached(()=>{ 
          this.controller.setCustomUserAgent(this.userAgent); 
          this.controller.loadUrl("https://www.huawei.com") 
        }) 
    }.height('100%') 
 
  } 
}