As described in https://github.com/electron/electron/pull/13769, we had to disable mixed sandbox related tests for Windows CI. We should re-enable them back after finding out the root reason.
atom/app/atom_main_delegate.cc
auto* command_line = base::CommandLine::ForCurrentProcess();
  std::string process_type =
      command_line->GetSwitchValueASCII(::switches::kProcessType);
  
  
  
  if (SubprocessNeedsResourceBundle(process_type)) {
    std::string locale = command_line->GetSwitchValueASCII(::switches::kLang);
    LoadResourceBundle(locale);
  }
  
  if (!IsBrowserProcess(command_line))
    return;
  
  command_line->AppendSwitch(::switches::kAllowFileAccessFromFiles);
#if defined(OS_MACOSX)
  
  command_line->AppendSwitch("enable-avfoundation");
#endif
}
void AtomMainDelegate::PreCreateMainMessageLoop() {