Crash after setting material of Text Render actor to an instance of the default material

Setting the material of Text Render to an instance of the default material then running as in Standalone results in a crash.

1. From the launcher, create a new Game project type -> Blank project
   2. Drag a Text Render actor into the NewMap
   3. Browse to the default text material (DefaultTextMaterialOpaque). Create a material instance of this, e.g. DefaultTextMaterialOpaque_Inst
   4. Set the Text material on the actor that was placed in the level to the new material instance
   5. Save everything (map + material instance).
   6. Play -> Standalone game

Result: Crash

Expected: No crash

Assertion failed: IsInRenderingThread() || IsInGameThread() || IsAsyncLoading() || GIsSavingPackage [Link Removed] [Line: 39]

UE4Editor_Core!AssertFailedImplV() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:100]
UE4Editor_Core!FDebug::CheckVerifyFailedImpl() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:450]
UE4Editor_Engine!FMICReentranceGuard::FMICReentranceGuard() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Engine\Private\Materials\MaterialInstanceSupport.h:39]
UE4Editor_Engine!UMaterialInstance::GetMaterial() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Engine\Private\Materials\MaterialInstance.cpp:657]
UE4Editor_Engine!FTextRenderSceneProxy::FTextRenderSceneProxy() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Engine\Private\Components\TextRenderComponent.cpp:662]
UE4Editor_Engine!UTextRenderComponent::CreateSceneProxy() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Engine\Private\Components\TextRenderComponent.cpp:1096]
UE4Editor_Renderer!FScene::AddPrimitive() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Renderer\Private\RendererScene.cpp:1291]
UE4Editor_Engine!<lambda_1c454102935558661824d22f5ad28ce6>::operator()() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Engine\Private\Components\ActorComponent.cpp:92]
UE4Editor_Engine!ParallelForImpl::TParallelForData<TFunctionRef<void __cdecl(int)> >::Process() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Public\Async\ParallelFor.h:169]
UE4Editor_Engine!TGraphTask<ParallelForImpl::TParallelForTask<TFunctionRef<void __cdecl(int)> > >::ExecuteTask() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Public\Async\TaskGraphInterfaces.h:849]
UE4Editor_Core!FTaskThreadAnyThread::ProcessTasks() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Async\TaskGraph.cpp:1039]
UE4Editor_Core!FTaskThreadAnyThread::ProcessTasksUntilQuit() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Async\TaskGraph.cpp:863]
UE4Editor_Core!FTaskThreadAnyThread::Run() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Async\TaskGraph.cpp:940]
UE4Editor_Core!FRunnableThreadWin::Run() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsRunnableThread.cpp:86]