MT5 Strategy Tester - strange object creation behaviour

Gents,

I'm currently playing with the new bar event handler lib (https://www.mql5.com/en/articles/159).

My goal is to simply draw a green arrow_up on a new bar. This is for testing and familiarising only ;-)

However, I'm seeing a lot of strange things happening:

1. Although the log shows that a new bar is detected from the very first second on, the arrows first time show up half a month after starting in strategy tester

2. In live testing the arrow is suddenly not an arrow like in strategy tester but a thumb up?

3. Often, the arrow does not get drawn at all, though in the same if statement and Print() is being run from the same if statement

My function to draw the arrow (for better readability I removed the error management):

bool IndicatorValues::DrawArrowUp(void)
  {
   bool result;
   arrow_label++;
   string label = IntegerToString(arrow_label);
   switch(ObjectFind(0,label))
     {
      case -1:
         ObjectCreate(ChartID(),label,OBJ_ARROW_UP,0,TimeCurrent(),SymbolInfoDouble(_Symbol,SYMBOL_BID));
         ObjectSetInteger(ChartID(),label,OBJPROP_ARROWCODE,241);
         ObjectSetInteger(ChartID(),label,OBJPROP_ANCHOR,ANCHOR_TOP);
         ObjectSetInteger(ChartID(),label,OBJPROP_WIDTH,8);
         ObjectSetInteger(ChartID(),label,OBJPROP_COLOR,clrRed);
         ObjectSetInteger(ChartID(),label,OBJPROP_STYLE,STYLE_SOLID);
         ObjectSetInteger(ChartID(),label,OBJPROP_HIDDEN,false);
         ObjectSetInteger(ChartID(),label,OBJPROP_BACK,false);
         ObjectSetString(ChartID(),label,OBJPROP_TEXT,IntegerToString(ObjectGetInteger(ChartID(),label,OBJPROP_TIME)));
         ObjectSetInteger(ChartID(),label,OBJPROP_SELECTABLE,true);
         result=true;
         break;
      case 0:
         result=false;
         break;
     }
     return(result);
  }

my function call in the EA (OnTick):

if(current_chart.isNewBar()>0)
     {
      ea.DrawArrowUp();
     
      Print("### MATCH ###");
      Print("LC: ",last_close_price," EMA: ",current_ema," RSI: ",current_rsi," LRSI: ",lastbar_rsi);
     }

I already considered my lack of coding knowledge (just started) as well as any possible bugs in MT5? The delayed start of arrow object creation in the strategy tester, could this possibly be related to poor history data?

Looking forward to your thoughts and ideas.