You can see it occurring on the water surface and with foliage specularity (and maybe shadows?). It’s seems to be an issue with reflections mostly, but I’ve never had this happen before in other UE versions. Disabling Lumen reflections and adjusting quality settings doesn’t change anything, I’ve gone through many settings and I can’t figure out what’s causing this.
After looking into it further, it just seems to be a rendering bug that appears at farther distances.