PaperMC/patches/server/0830-Only-erase-allay-memory-on-non-item-targets.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Bjarne Koll <git@lynxplay.dev>
Date: Fri, 4 Aug 2023 15:53:36 +0200
Subject: [PATCH] Only erase allay memory on non-item targets

Spigot incorrectly instanceOf checks the EntityTargetEvent#getTarget
against the internal ItemEntity type and removes the nearest wanted item
memory if said instanceOf check fails, (which is always the case)
causing allays to behave differently as they constantly lose their
target item.

This commit fixes the faulty behaviour by instance performing a check
against the CraftItem type.

diff --git a/src/main/java/net/minecraft/world/entity/ai/behavior/GoToWantedItem.java b/src/main/java/net/minecraft/world/entity/ai/behavior/GoToWantedItem.java
index 07db92870f9efd515751453569f0dd7b6fada8fc..7d814e5b4b634674995d55ab97155f949f14ef3b 100644
--- a/src/main/java/net/minecraft/world/entity/ai/behavior/GoToWantedItem.java
+++ b/src/main/java/net/minecraft/world/entity/ai/behavior/GoToWantedItem.java
@@ -35,8 +35,9 @@ public class GoToWantedItem {
                             if (event.isCancelled()) {
                                 return false;
                             }
-                            if (!(event.getTarget() instanceof ItemEntity)) {
+                            if (!(event.getTarget() instanceof org.bukkit.craftbukkit.entity.CraftItem)) { // Paper - only erase allay memory on non-item targets
                                 memoryaccessor2.erase();
+                                return false; // Paper - only erase allay memory on non-item targets
                             }
 
                             entityitem = (ItemEntity) ((org.bukkit.craftbukkit.entity.CraftEntity) event.getTarget()).getHandle();