AA (TSR) Flickering on high-poly meshes

Hey, struggling with some high-poly roof meshes at a certain distance from the camera.

I am using Lumen with Nanite enabled, but they do not seem to have any effect. It seems like AA is the main culprit, but don’t want to disable AA.

Any Ideas?

My initial guess is shadow aliasing if you’re using RT shadows and proxy meshes. Otherwise, are you using normal preservation on them? I could see nanite accidentally creating strange normals by mistake as assets move into the distance. What do other AA modes do?