Hi im having a similar issue i can't launch dx12 or dx11 it gives a fatal error without any logs or anything. But i can launch with vulkan. My GPU is rtx 3080ti.
Viewing post in Erokin v0.4-public released - Unreal Engine 5 comments
I just tried launching vulkan and when i clicked start game i was stuck in the loading screen, and then it crashed me giving me this error
LowLevelFatalError [File:D:\build\++UE5\Sync\Engine\Source\Runtime\RenderCore\Private\RenderingThread.cpp] [Line: 1272]
GameThread timed out waiting for RenderThread after 120.00 secs
now everytime i try to launch with vulkan it freezes the game and gvies me the same error.