I can confirm turning down the ground cover from ultra to high fixes this problem. I my case it was the stage Moissière that was crashing all the time
LowLevelFatalError [File:Unknown] [Line: 684] pResource->Map(Subresource, pReadRange, reinterpret_cast<void**>(&pData)) failed at D:\dev\p4\277be2e39a9e804\ue4\Engine\Source\Runtime\D3D12RHI\Private\D3D12RHIPrivate.h:1195 with error DXGI_ERROR_DEVICE_REMOVED with Reason: DXGI_ERROR_DEVICE_HUNG
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kernel32
ntdll
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