This sounds like a classic Nanite + landscape material interaction issue, especially when displacement is involved through auto-material systems like Sensei’s setup.
From what you’re describing (shadow artifacts appearing close up and disappearing at distance, and only happening with Nanite enabled), it’s most likely related to how Nanite is handling virtualized geometry combined with displaced surface details and shadowing.
A few common causes:
Nanite displacement not fully compatible with certain landscape material setups
Virtual shadow maps producing artifacts on high-frequency displaced surfaces
LOD transition mismatch between Nanite and non-Nanite fallback behavior
Auto-material layer blending creating unstable normals or depth changes
If it disappears when you disable Nanite, that strongly confirms it’s tied to Nanite’s rendering path rather than the material itself.
If you want, I can take a closer look at your setup and help you isolate the exact cause and adjust the material/engine settings so it renders cleanly again.
I’m much more active on Discord than here, so for faster communication you can reach me there: splendid0001