Paper/nms-patches/PathfinderGoalFollowOwner.patch

--- a/net/minecraft/server/PathfinderGoalFollowOwner.java
+++ b/net/minecraft/server/PathfinderGoalFollowOwner.java
@@ -1,6 +1,11 @@
 package net.minecraft.server;
 
 import java.util.EnumSet;
+// CraftBukkit start
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.entity.CraftEntity;
+import org.bukkit.event.entity.EntityTeleportEvent;
+// CraftBukkit end
 
 public class PathfinderGoalFollowOwner extends PathfinderGoal {
 
@@ -104,7 +109,18 @@
         } else if (!this.a(new BlockPosition(i, j, k))) {
             return false;
         } else {
-            this.a.setPositionRotation((double) ((float) i + 0.5F), (double) j, (double) ((float) k + 0.5F), this.a.yaw, this.a.pitch);
+            // CraftBukkit start
+            CraftEntity entity = this.a.getBukkitEntity();
+            Location to = new Location(entity.getWorld(), (double) ((float) i + 0.5F), (double) j, (double) ((float) k + 0.5F), this.a.yaw, this.a.pitch);
+            EntityTeleportEvent event = new EntityTeleportEvent(entity, entity.getLocation(), to);
+            this.a.world.getServer().getPluginManager().callEvent(event);
+            if (event.isCancelled()) {
+                return false;
+            }
+            to = event.getTo();
+
+            this.a.setPositionRotation(to.getX(), to.getY(), to.getZ(), to.getYaw(), to.getPitch());
+            // CraftBukkit end
             this.e.o();
             return true;
         }