Paper/nms-patches/EntityLlamaTrader.patch

--- a/net/minecraft/server/EntityLlamaTrader.java
+++ b/net/minecraft/server/EntityLlamaTrader.java
@@ -128,7 +128,7 @@
 
         @Override
         public void c() {
-            this.e.setGoalTarget(this.c);
+            this.e.setGoalTarget(this.c, org.bukkit.event.entity.EntityTargetEvent.TargetReason.TARGET_ATTACKED_OWNER, true); // CraftBukkit
             Entity entity = this.b.getLeashHolder();
 
             if (entity instanceof EntityVillagerTrader) {