PaperMC/patches/unapplied/server/0081-Do-not-load-chunks-for-Pathfinding.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 31 Mar 2016 19:17:58 -0400
Subject: [PATCH] Do not load chunks for Pathfinding


diff --git a/src/main/java/net/minecraft/world/level/pathfinder/WalkNodeEvaluator.java b/src/main/java/net/minecraft/world/level/pathfinder/WalkNodeEvaluator.java
index 235b01e23a8997d0d65de3655b3b3ff50a204c06..c48e097464977dbec22d1370c3393ba1fe105137 100644
--- a/src/main/java/net/minecraft/world/level/pathfinder/WalkNodeEvaluator.java
+++ b/src/main/java/net/minecraft/world/level/pathfinder/WalkNodeEvaluator.java
@@ -477,7 +477,12 @@ public class WalkNodeEvaluator extends NodeEvaluator {
                 for(int n = -1; n <= 1; ++n) {
                     if (l != 0 || n != 0) {
                         pos.set(i + l, j + m, k + n);
-                        BlockState blockState = world.getBlockState(pos);
+                        // Paper start
+                        BlockState blockState = world.getBlockStateIfLoaded(pos);
+                        if (blockState == null) {
+                            return BlockPathTypes.BLOCKED;
+                        } else {
+                        // Paper end
                         if (blockState.is(Blocks.CACTUS)) {
                             return BlockPathTypes.DANGER_CACTUS;
                         }
@@ -493,6 +498,7 @@ public class WalkNodeEvaluator extends NodeEvaluator {
                         if (world.getFluidState(pos).is(FluidTags.WATER)) {
                             return BlockPathTypes.WATER_BORDER;
                         }
+                        } // Paper
                     }
                 }
             }
@@ -502,7 +508,8 @@ public class WalkNodeEvaluator extends NodeEvaluator {
     }
 
     protected static BlockPathTypes getBlockPathTypeRaw(BlockGetter world, BlockPos pos) {
-        BlockState blockState = world.getBlockState(pos);
+        BlockState blockState = world.getBlockStateIfLoaded(pos); // Paper
+        if (blockState == null) return BlockPathTypes.BLOCKED; // Paper
         Block block = blockState.getBlock();
         Material material = blockState.getMaterial();
         if (blockState.isAir()) {