Shipping build do not accept comand line arguments

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Here is the code that epic uses to create the game mode for default map when game engine is being loaded.

void UGameInstance::StartGameInstance()
{
UEngine* const Engine = GetEngine();

// Create default URL.
// @note: if we change how we determine the valid start up map update LaunchEngineLoop's GetStartupMap()
FURL DefaultURL;
DefaultURL.LoadURLConfig(TEXT("DefaultPlayer"), GGameIni);

// Enter initial world.
EBrowseReturnVal::Type BrowseRet = EBrowseReturnVal::Failure;
FString Error;
TCHAR Parm[4096] = TEXT("");
const TCHAR* Tmp = FCommandLine::Get();

#if UE_BUILD_SHIPPING
// In shipping don’t allow an override
Tmp = TEXT(“”);
#endif // UE_BUILD_SHIPPING

//other code
}

so you can get the real reason in here.