r.ShaderpipelineCache.StartupMode=0 does NOT work property

FEngineLoop::Init()
{
...
   FShaderPipelineCache::PauseBatching();
   {
#if defined(WITH_CODE_GUARD_HANDLER) && WITH_CODE_GUARD_HANDLER
   void CheckImageIntegrity();
   CheckImageIntegrity();
#endif
   }

   {
   SCOPED_BOOT_TIMING("FCoreDelegates::OnFEngineLoopInitComplete.Broadcast()");
   FCoreDelegates::OnFEngineLoopInitComplete.Broadcast();
   }
   FShaderPipelineCache::ResumeBatching();
...
}

void FShaderPipelineCache::Initialize(EShaderPlatform Platform)
{
   check(ShaderPipelineCache == nullptr);
   if (FShaderCodeLibrary::IsEnabled())
   {
      FPipelineFileCache::Initialize(GetGameVersionForPSOFileCache());
      ShaderPipelineCache = new FShaderPipelineCache(Platform);
      // add
      if (CVarPSOFileCacheStartupMode.GetValueOnAnyThread() == 0)
      {
         // for ShaderPipelineCache->PausedCount++; 
         PauseBatching();
      }
      // add
   }
}