为什么Serilog（.Extras。）Web的ApplicationLifecycleModule.Init（）调用了两次？

Question

我在IIS（7.5）中作为"Default Web Site"下的应用程序托管了一个Web API，并使用了Serilog.Extras.Web中的几个Enrichers（我将很快升级到SerilogWeb.Classic包）。我在日志中注意到每个请求ApplicationLifecycleModule.LogRequest()被称为两次，我正在努力理解原因。

我注意到ApplicationLifecycleModule.Init()被调用了两次，因此注册了两个事件处理程序。

第一个callstack：

Serilog.Extras.Web.dll!Serilog.Extras.Web.ApplicationLifecycleModule.Init(System.Web.HttpApplication context)
System.Web.dll!System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(System.IntPtr appContext, System.Web.HttpContext context, System.Reflection.MethodInfo[] handlers)
System.Web.dll!System.Web.HttpApplication.InitSpecial(System.Web.HttpApplicationState state, System.Reflection.MethodInfo[] handlers, System.IntPtr appContext, System.Web.HttpContext context)
System.Web.dll!System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(System.IntPtr appContext, System.Web.HttpContext context)
System.Web.dll!System.Web.Hosting.PipelineRuntime.InitializeApplication(System.IntPtr appContext)
[AppDomain Transition]

第二个：

Serilog.Extras.Web.dll!Serilog.Extras.Web.ApplicationLifecycleModule.Init(System.Web.HttpApplication context)
System.Web.dll!System.Web.HttpApplication.InitModulesCommon()
System.Web.dll!System.Web.HttpApplication.InitInternal(System.Web.HttpContext context, System.Web.HttpApplicationState state, System.Reflection.MethodInfo[] handlers)
System.Web.dll!System.Web.HttpApplicationFactory.GetNormalApplicationInstance(System.Web.HttpContext context)
System.Web.dll!System.Web.HttpApplicationFactory.GetApplicationInstance(System.Web.HttpContext context)
System.Web.dll!System.Web.HttpRuntime.ProcessRequestNotificationPrivate(System.Web.Hosting.IIS7WorkerRequest wr, System.Web.HttpContext context)
System.Web.dll!System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(System.IntPtr rootedObjectsPointer, System.IntPtr nativeRequestContext, System.IntPtr moduleData, int flags)
System.Web.dll!System.Web.Hosting.PipelineRuntime.ProcessRequestNotification(System.IntPtr rootedObjectsPointer, System.IntPtr nativeRequestContext, System.IntPtr moduleData, int flags)

我做错了吗？或者这是ApplicationLifecycleModule中的错误？