GetBars returns no result for pair GBPUSD

Hello,

I am trying to code a bot running on multiple symbols.

I then have a variable which contains all symbols as an array and I am looping through it to initialize my indicators in the OnStart method.

This works fine except for symbol GBPNZD for which MarketData.GetBars return an empty result in backtest:

TF1 = TimeFrame
for(int i = 0; i < symbols.Count(); i++)
            {
            
                barsTF1 = MarketData.GetBars(TF1, symbols[i]);
                Print(symbols[i]);
                Print(barsTF1.Count); // <= This returns 0 for GBPNZD but return results for EURUSD, GBPUSD etc...
            }

Issue is happening if I am running the backtest with chart symbol GBPUSD with timeframe H4.

Strange thing is that if I change chart symbol to GBPNZD then I don't have the issue anymore meaning that bars are retrieved for this symbol with method MarketData.GetBars.

Does someone know if I am missing something obvious or if this is a known bug?

Thanks in advance