Previewing Nav Mesh in DX12 Mode causes Editor to Crash

In UE4.11p6, previewing Nav Mesh in DX12 Mode causes Editor to crash.

1. Open Editor in DX12 Mode (in shortcut add -dx12 to target, after quotation marks, and for the editor itself, not the launcher)
2. Create a new Third Person Project (No Starter Content Needed)
3. Add a Nav Mesh Volume to the scene in the Viewport and size to engulf all static meshes in the scene
4. Build
5. Press "P" to preview Nav Mesh affected areas
   RESULT: Editor Crashes
   EXPECTED: Affected areas to be highlighted green

UE4Editor_D3D12RHI!D3D12RHI::VerifyD3D11Result() d3d12util.cpp:221
UE4Editor_D3D12RHI!FD3D12PipelineState::Create() d3d12statecache.cpp:3596
UE4Editor_D3D12RHI!FD3D12PipelineStateCache::Add() d3d12statecache.cpp:1756
UE4Editor_D3D12RHI!FD3D12PipelineStateCache::FindGraphicsLowLevel() d3d12statecache.cpp:1717
UE4Editor_D3D12RHI!FD3D12PipelineStateCache::FindGraphics() d3d12statecache.cpp:1671
UE4Editor_D3D12RHI!FD3D12StateCacheBase::ApplyState() d3d12statecache.cpp:853
UE4Editor_D3D12RHI!FD3D12CommandContext::RHIEndDrawPrimitiveUP() d3d12commands.cpp:1651
UE4Editor_Engine!FBatchedElements::Draw() batchedelements.cpp:911
UE4Editor_Engine!FSimpleElementCollector::DrawBatchedElements() scenemanagement.cpp:162
UE4Editor_Renderer!FDeferredShadingSceneRenderer::RenderEditorPrimitives() deferredshadingrenderer.cpp:577
UE4Editor_Renderer!FDeferredShadingSceneRenderer::RenderBasePass() deferredshadingrenderer.cpp:1878
UE4Editor_Renderer!FDeferredShadingSceneRenderer::Render() deferredshadingrenderer.cpp:1060
UE4Editor_Renderer!RenderViewFamily_RenderThread() scenerendering.cpp:1744
UE4Editor_Renderer!TGraphTask<`FRendererModule::BeginRenderingViewFamily'::`20'::EURCMacro_FDrawSceneCommand>::ExecuteTask() taskgraphinterfaces.h:886
UE4Editor_Core!FNamedTaskThread::ProcessTasksNamedThread() taskgraph.cpp:779
UE4Editor_Core!FNamedTaskThread::ProcessTasksUntilQuit() taskgraph.cpp:526
UE4Editor_RenderCore!RenderingThreadMain() renderingthread.cpp:310
UE4Editor_RenderCore!FRenderingThread::Run() renderingthread.cpp:417
UE4Editor_Core!FRunnableThreadWin::Run() windowsrunnablethread.cpp:74

[UE-23848] Bug Status

Fix UE-51650

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