Modified Pending Order gets cancelled

Hello, I have isolated the behaviour that is causing me some trouble in my own bot. When I place a pending order then modify it the pending order gets cancelled without me having called CanclePendingOrder.

I ran this on EURUSD and the 2 minute candle chart on the 5th of January 2018 with ICMarkets data, but it should cause the issue even on different markets and times.

 

    [Robot(AccessRights = AccessRights.None)]
    public class NewcBot : Robot
    {
        [Parameter(DefaultValue = "Hello world!")]
        public string Message { get; set; }

        DateTime tradeTime =  new DateTime(2018, 1, 5, 7, 6, 0);
        Ticks ticks;
        protected override void OnStart()
        {
            // To learn more about cTrader Automate visit our Help Center:
            // https://help.ctrader.com/ctrader-automate

            ticks = MarketData.GetTicks(SymbolName);
        }

        protected override void OnTick()
        {
            var t = ticks.Last().Time;
            if(t.Year == tradeTime.Year && t.Month == tradeTime.Month && t.Day == tradeTime.Day && t.Hour == tradeTime.Hour && t.Minute == tradeTime.Minute) {
                if(PendingOrders.Count < 1) {
                    PlaceStopLimitOrder(TradeType.Buy, SymbolName, 167000, 1.2061, 0.0, "long", 6.0, 7.0);
                }
            }
        }

        protected override void OnBar() 
        {
            var bar = Bars.Last(1);
            if(bar.OpenTime.Hour == 7 && bar.OpenTime.Minute == 6)
            {
                foreach(var porder in PendingOrders) 
                {
                    ModifyPendingOrder(porder, 1.20595, 4.5, 7.0);
                }
            }

        }
        
        
        protected override void OnStop()
        {
            // Handle cBot stop here
        }
    }