Core/Units: Prevent backward melee attacks (#28895)

src/server/game/AI/CoreAI/UnitAI.cpp

@@ -68,6 +68,10 @@ void UnitAI::DoMeleeAttackIfReady()
     if (!me->IsWithinMeleeRange(victim))
         return;
 
+    // Check that the victim is in front of the unit
+    if (!me->HasInArc(2 * float(M_PI) / 3, victim))
+        return;
+
     //Make sure our attack is ready and we aren't currently casting before checking distance
     if (me->isAttackReady())
     {