Crash when trying to "Update Mesh Section" on any procedural mesh just after "Clear Mesh Section" and "Create Mesh Section" for different vertices and triangles.

the editor Crashes when trying to "Update Mesh Section" on any procedural mesh just after "Clear Mesh Section" and "Create Mesh Section" for different vertices and triangles.

Found in 4.19 CL# 4033788, 4.20 Preview 2 CL# 4121666, 4.21 CL# 4131780

1. Open attached project
2. Play in editor
3. Press space

Results:
The editor will crash

Expected:
The procedural meshes verts and tris would be changed as the custom event set them.

Fatal error: [Link Removed] [Line: 826]
Rendering thread exception:
Assertion failed: (void*)((&ElementData[VertexIndex]) + 1) <= (void*)(TangentsDataPtr + TangentsData->GetResourceSize()) [Link Removed] [Line: 281]

KERNELBASE.dll!UnknownFunction []
UE4Editor-ApplicationCore.dll!FWindowsErrorOutputDevice::Serialize() [f:\release\engine\source\runtime\applicationcore\private\windows\windowserroroutputdevice.cpp:65]
UE4Editor-Core.dll!FOutputDevice::LogfImpl() [f:\release\engine\source\runtime\core\private\misc\outputdevice.cpp:70]
UE4Editor-Core.dll!FDebug::AssertFailed() [f:\release\engine\source\runtime\core\private\misc\assertionmacros.cpp:425]
UE4Editor-ProceduralMeshComponent.dll!FProceduralMeshSceneProxy::UpdateSection_RenderThread() [f:\release\engine\plugins\runtime\proceduralmeshcomponent\source\proceduralmeshcomponent\private\proceduralmeshcomponent.cpp:211]
UE4Editor-ProceduralMeshComponent.dll!TGraphTask<`UProceduralMeshComponent::UpdateMeshSection'::`37'::EURCMacro_FProcMeshSectionUpdate>::ExecuteTask() [f:\release\engine\source\runtime\core\public\async\taskgraphinterfaces.h:829]
UE4Editor-Core.dll!FNamedTaskThread::ProcessTasksNamedThread() [f:\release\engine\source\runtime\core\private\async\taskgraph.cpp:665]
UE4Editor-Core.dll!FNamedTaskThread::ProcessTasksUntilQuit() [f:\release\engine\source\runtime\core\private\async\taskgraph.cpp:574]
UE4Editor-RenderCore.dll!RenderingThreadMain() [f:\release\engine\source\runtime\rendercore\private\renderingthread.cpp:333]
UE4Editor-RenderCore.dll!FRenderingThread::Run() [f:\release\engine\source\runtime\rendercore\private\renderingthread.cpp:467]
UE4Editor-Core.dll!FRunnableThreadWin::Run() [f:\release\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:76]
UE4Editor-Core.dll!FRunnableThreadWin::GuardedRun() [f:\release\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:33]
KERNEL32.DLL!UnknownFunction []
ntdll.dll!UnknownFunction []

Fix UE-51650

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