One-PositionSizer-instance-used-accross-multiple-Backtester-instances-during-optimization-run

C# Code to reproduce the issue... Wanted to make a position size chage by code in every single optimization run but it turned out impossible with parallel optimization.

CODE:

public override void BacktestBegin()
{
     List<Backtester> lst;
     if (HasGlobal("Backtester"))
         lst = (List<Backtester>)GetGlobal("Backtester");
     else
         lst = new List<Backtester>();
     if (lst.Contains(Backtester))
         WLHost.Instance.AddLogItem("TEST", "Same backtester instance", WLColor.Green);
     else
         lst.Add(Backtester);
     SetGlobal("Backtester", lst);

     List<PositionSize> lst1;
     if (HasGlobal("PositionSize"))
         lst1 = (List<PositionSize>)GetGlobal("PositionSize");
     else
         lst1 = new List<PositionSize>();
     if (lst1.Contains(Backtester.PositionSize))
         WLHost.Instance.AddLogItem("TEST", "Same PositionSize instance", WLColor.Green);
     else
         lst1.Add(Backtester.PositionSize);
     SetGlobal("PositionSize", lst1);
}

This code showes that backtester instances are different on each run having same instance of PositionSize.