Video Conflict between Spatializer plugins and Low-level graphics plugin.

I'm using low-level graphics plugin for HoloLens. The problem is, using any spatializer included in Unity breaks the low-level graphics code. The following is code relevant to the problem.

static IUnityInterfaces* unity_interfaces_ = 0;
static IUnityGraphics* unity_graphics_ = 0;
static ID3D11Device* d3d11_device_ = 0;
static ID3D11DeviceContext* d3d11_device_context_ = 0;

// Function that gets called by Unity.
extern "C" void UNITY_INTERFACE_EXPORT UNITY_INTERFACE_API UnityPluginLoad(IUnityInterfaces* interfaces)
{
print_debug("UnityPluginLoad");
unity_interfaces_ = interfaces;
unity_graphics_ = unity_interfaces_->Get<IUnityGraphics>();
unity_graphics_->RegisterDeviceEventCallback(OnGraphicsDeviceEvent);

// Run OnGraphicsDeviceEvent(initialize) manually on plugin load
// to not miss the event in case the graphics device is already initialized
#ifdef _WIN64
OnGraphicsDeviceEvent(kUnityGfxDeviceEventInitialize);
#endif
}

// Callback function to handle UnityGfxDeviceEvents.
static void UNITY_INTERFACE_API OnGraphicsDeviceEvent(UnityGfxDeviceEventType eventType)
{
switch(eventType)
{
case kUnityGfxDeviceEventInitialize:
{
IUnityGraphicsD3D11* d3d = unity_interfaces_->Get<IUnityGraphicsD3D11>();
d3d11_device_ = d3d->GetDevice();
d3d11_device_->GetImmediateContext(&d3d11_device_context_);
break;
}
case kUnityGfxDeviceEventShutdown:
{
d3d11_device_ = 0;
d3d11_device_context_ = 0;
break;
}
};
}

In the code above, OnGraphicsDeviceEvent gets called with kUnityGfxDeviceEventInitialize at the beginning of the application. However, d3d->GetDevice() returns nullptr instead of a IUnityGraphicsD3D11* when any spatializer plugin is included to the application. By any, I mean MS/Oculus/Resonance. This is a bug which I want to detour. Is there anybody who knows how to access to Unity's IUnityGraphicsD3D11* in a different way?

 

In the above, I mean ID3D11Device's instead of IUnityGraphicsD3D11's in the last paragraph. I can't edit it since this website considers me as a spammer.