From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Mon, 19 Dec 2016 23:07:42 -0500
Subject: [PATCH] Prevent Pathfinding out of World Border

This prevents Entities from trying to run outside of the World Border

diff --git a/src/main/java/net/minecraft/world/entity/ai/navigation/NavigationAbstract.java b/src/main/java/net/minecraft/world/entity/ai/navigation/NavigationAbstract.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/world/entity/ai/navigation/NavigationAbstract.java
+++ b/src/main/java/net/minecraft/world/entity/ai/navigation/NavigationAbstract.java
@@ -0,0 +0,0 @@ public abstract class NavigationAbstract {
             // Paper start - Pathfind event
             boolean copiedSet = false;
             for (BlockPosition possibleTarget : set) {
-                if (!new com.destroystokyo.paper.event.entity.EntityPathfindEvent(getEntity().getBukkitEntity(),
+                if (!getEntity().getWorld().getWorldBorder().isInBounds(possibleTarget) || !new com.destroystokyo.paper.event.entity.EntityPathfindEvent(getEntity().getBukkitEntity(), // Paper - don't path out of world border
                     MCUtil.toLocation(getEntity().world, possibleTarget), target == null ? null : target.getBukkitEntity()).callEvent()) {
                     if (!copiedSet) {
                         copiedSet = true;