For what it’s worth, same issue with different hardware (HTC Vive) and different UE4 version after installing the GPU lightmass plugin for UE 4.27.2, enabling the subsequent configuration requirements and baking my light maps. Baking goes well but the game then systematically crashes. I assume that my setup does not agree with DX12 and OpenXR together. I hope there is a workaround or a fix soon: baking with GPU lightmass is significantly faster, if we VR users cannot (yet) use Lumen, at least let us bake static lighting faster, pretty please …