Hi, I’ve tried opening Sci_Fi_City, Sci_Fi_City_Rain_Day and Sci_Fi_City_Rain_Day_Combine flying around, waiting a bit and can’t reproduce it. Maybe it’s something specific to 3090, as I don’t have a 3090 at the moment.
As a workaround for your normal issue you could use the Ray Tracing Quality Switch Replace node to remove normals only from Lumen. looking at the density of your geometry it shouldn’t really change much.