### Preflight Checklist

- [X] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/main/CONTRIBUTING.md) for this project.
- [X] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/main/CODE_OF_CONDUCT.md) that this project adheres to.
- [X] I have searched the [issue tracker](https://www.github.com/electron/electron/issues) for a bug report that matches the one I want to file, without success.

### Electron Version

16.0.0

### What operating system are you using?

Windows

### Operating System Version

WIN10 20H2

### What arch are you using?

x64

### Last Known Working Electron version

_No response_

### Expected Behavior

 win.webContents.savePage('d:/aaaaaa.html', 'HTMLComplete').then(() => {
      console.log('Page was saved successfully.')
    }).catch(err => {
      console.log(err)
    })

it will generate a html page file at d: 

### Actual Behavior

savePage has three formats that can be used

if use HTMLComplete
 only produced a aaaaaa_files empty folder

if use HTMLonly 
No files are generated nor error callbacks are generated

MHTML option works fine

### Testcase Gist URL

_No response_

### Additional Information

_No response_
shell/browser/api/electron_api_web_contents.cc
const base::TimeTicks& proceed_time) {
  
  
}
void WebContents::HandleNewRenderFrame(
    content::RenderFrameHost* render_frame_host) {
  auto* rwhv = render_frame_host->GetView();
  if (!rwhv)
    return;
  
  auto* web_preferences = WebContentsPreferences::From(ontents());
  if (web_preferences) {
    bool guest = IsGuest() || type_ == Type::kBrowserView;
    absl::optional<SkColor> color =
        guest ? SK_ColorTRANSPARENT : web_preferences->GetBackgroundColor();
    ontents()->SetPageBaseBackgroundColor(color);
    SetBackgroundColor(rwhv, color.value_or(SK_ColorWHITE));
  }
  if (!background_throttling_)
    render_frame_host->GetRenderViewHost()->SetSchedulerThrottling(false);
  auto* rwh_impl =
      static_cast<content::RenderWidgetHostImpl*>(rwhv->GetRenderWidgetHost());
  if (rwh_impl)
    rwh_impl->disable_hidden_ = !background_throttling_;
  auto* web_frame = WebFrameMain::FromRenderFrameHost(render_frame_host);
  if (web_frame)
    web_frame->Connect();
}
void WebContents::OnBackgroundColorChanged() {