does it still do this in PIE? (when you hit the play button at the top)
what are the settings in your Post Processing Volume?
in the Post Processing Volume Rendering Features-> Path Tracing
is that enabled? what is the value in that box (I think disabled and like 32 is the default) if you drop this to something like 16 or 8 does that make it better? It might not be super sharp but it should clean up the jagged stair step effect, and this should be something that is modified by settings configurations kind of anyways. if not having a shadows option that is basically “pre-baked shadows”