Core/Unit: Stop mobs and pets from agressing invisible targets - they can't fight what they can't see

src/server/game/Entities/Unit/Unit.cpp

@@ -12108,6 +12108,9 @@ bool Unit::canAttack(Unit const* target, bool force) const
         if (IsOnVehicle(target) || m_vehicle->GetBase()->IsOnVehicle(target))
             return false;
 
+    if (!canSeeOrDetect(target))
+        return false;
+
     return true;
 }