PaperMC/nms-patches/PathfinderGoalHurtByTarget.patch

--- a/net/minecraft/server/PathfinderGoalHurtByTarget.java
+++ b/net/minecraft/server/PathfinderGoalHurtByTarget.java
@@ -23,7 +23,7 @@
     }
 
     public void c() {
-        this.e.setGoalTarget(this.e.getLastDamager());
+        this.e.setGoalTarget(this.e.getLastDamager(), org.bukkit.event.entity.EntityTargetEvent.TargetReason.TARGET_ATTACKED_ENTITY, true); // CraftBukkit - reason
         this.b = this.e.be();
         if (this.a) {
             double d0 = this.f();
@@ -58,6 +58,6 @@
     }
 
     protected void a(EntityCreature entitycreature, EntityLiving entityliving) {
-        entitycreature.setGoalTarget(entityliving);
+        entitycreature.setGoalTarget(entityliving, org.bukkit.event.entity.EntityTargetEvent.TargetReason.TARGET_ATTACKED_NEARBY_ENTITY, true); // CraftBukkit - reason
     }
 }