As for driver issues with Nvidia - Epic’s plugin GPUlightmass is reported by its developer Luoshuang to have problems with Nvidia drivers newer than 522.25
See Epic's GPUlightmass - #423 by Luoshuang
and Epic's GPUlightmass - #438 by Luoshuang
So maybe try to roll back to that driver so you can use DX12 and TSRAA again?
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