From ab51822fd4e95306f031f05c3f6f8fda1711f413 Mon Sep 17 00:00:00 2001
From: Brian Neumann-Fopiano <mypsn1550@gmail.com>
Date: Thu, 22 Oct 2026 01:32:15 -0400
Subject: [PATCH] Single subterrain check per write

- Drop the repeated subterrain protection lookup inside MantleWriter.setData; the same position was already rejected before the chunk lock
---
 .../java/art/arcane/iris/generation/mantle/MantleWriter.java    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/src/main/java/art/arcane/iris/generation/mantle/MantleWriter.java b/core/src/main/java/art/arcane/iris/generation/mantle/MantleWriter.java
index bb94e272f..0a88389d7 100644
--- a/core/src/main/java/art/arcane/iris/generation/mantle/MantleWriter.java
+++ b/core/src/main/java/art/arcane/iris/generation/mantle/MantleWriter.java
@@ -244,7 +244,7 @@ public class MantleWriter implements ObjectPassPlacer, AutoCloseable {
         synchronized (chunk) {
             Matter matter = chunk.getOrCreate(y >> 4);
             if ((t instanceof NativeBlockState || t instanceof MatterCavern)
-                    && (hasProtectedHydrology(matter, x, y, z) || protectsSubterrainPlacement(x, y, z))) {
+                    && hasProtectedHydrology(matter, x, y, z)) {
                 return;
             }
             if (t instanceof NativeBlockState) {