Fix NanoVDB upload buffer early release causing white screen

NanoVDBLoader.cpp

@@ -92,7 +92,11 @@ bool LoadNanoVDB(const char* filePath, NanoVDBData& outData, ID3D12GraphicsComma
             barrier.Transition.StateAfter = D3D12_RESOURCE_STATE_GENERIC_READ;
             cmdList->ResourceBarrier(1, &barrier);
             
+            EndCommandList();
+            WaitForCompletionOfCommandList();
             uploadBuffer->Release();
+            GetCommandAllocator()->Reset();
+            cmdList->Reset(GetCommandAllocator(), nullptr);
         }
         
         std::cout << "[NanoVDB] Loaded: " << byteSize << " bytes, " << elementCount << " elements" << std::endl;