Renko Backtest Spread settings not working

Hello! 
when I want to backtest my strategie and I select "RE1" Renko on US 30 with these Settings. The Spread is always 0. Is this a bug? When i select for example 1minute candles the spread works correctly. Is just used this Bot (just outputs the current spread)


using cAlgo.API;

using cAlgo.API.Internals;

using cAlgo.API.Indicators;

namespace cAlgo.Robots

{

    [Robot(TimeZone = TimeZones.UTC, AccessRights = AccessRights.None)]

    public class SpreadBot : Robot

    {

        protected override void OnTick()

        {

            // Den aktuellen Bid- und Ask-Preis abrufen

            double bidPrice = Symbol.Bid;

            double askPrice = Symbol.Ask;

            // Den Spread in Pips berechnen

            double spreadInPips = (askPrice - bidPrice) / Symbol.PipSize;

            // Den Spread in Pips in das Protokoll schreiben

            Print("Aktueller Spread in Pips: ", spreadInPips);

        }

    }

}

Working on Mac Version 5.0.20