Crash after switching materials on a particle system mesh and saving the mesh

The repro steps are very similar to https://jira.ol.epicgames.net/browse/UE-34241 except that you have to save the static mesh before switching back to the particle editor.

1. Open QAGame
2. Open the particle system: PS_Mesh (located in ParticleSystem'/Game/Effects/ParticleSystems
3. Select the Mesh Data
4. Double click on ParticleCube to open the Mesh
5. Change the Material on the mesh to Aluminum.
6. Save the static mesh.
7. Switch back to PS_Mesh in the particle editor.

Result: Editor crashes

UE4Editor_D3D11RHI!FD3D11DynamicRHI::RHISetStreamSource() d3d11commands.cpp:81
UE4Editor_ShaderCore!FVertexFactory::Set() vertexfactory.cpp:181
UE4Editor_Renderer!TBasePassDrawingPolicy<FUniformLightMapPolicy>::SetSharedState() basepassrendering.h:943
UE4Editor_Renderer!FDrawBasePassDynamicMeshAction::Process<FUniformLightMapPolicy>() basepassrendering.cpp:499
UE4Editor_Renderer!ProcessBasePassMesh<FDrawBasePassDynamicMeshAction>() basepassrendering.h:1468
UE4Editor_Renderer!FBasePassOpaqueDrawingPolicyFactory::DrawDynamicMesh() basepassrendering.cpp:575
UE4Editor_Renderer!FDeferredShadingSceneRenderer::RenderBasePassDynamicData() basepassrendering.cpp:939
UE4Editor_Renderer!FDeferredShadingSceneRenderer::RenderBasePass() basepassrendering.cpp:761
UE4Editor_Renderer!FDeferredShadingSceneRenderer::Render() deferredshadingrenderer.cpp:872
UE4Editor_Renderer!RenderViewFamily_RenderThread() scenerendering.cpp:1849
UE4Editor_Renderer!TGraphTask<`FRendererModule::BeginRenderingViewFamily'::`21'::EURCMacro_FDrawSceneCommand>::ExecuteTask() taskgraphinterfaces.h:868
UE4Editor_Core!FNamedTaskThread::ProcessTasksNamedThread() taskgraph.cpp:932
UE4Editor_Core!FNamedTaskThread::ProcessTasksUntilQuit() taskgraph.cpp:679
UE4Editor_RenderCore!RenderingThreadMain() renderingthread.cpp:319
UE4Editor_RenderCore!FRenderingThread::Run() renderingthread.cpp:440
UE4Editor_Core!FRunnableThreadWin::Run() windowsrunnablethread.cpp:74
Modules Functions File Names & Lines File Paths & Lines Unformatted

[UE-23848] Bug Status

Fix UE-51650

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