What time frame do you trade?

if you use Week Closing at Friday 23.56, it must be M1.

Does you broker trade until 23:56?

This indicator is available for more than 10 years. It is very unlikely to find a bug now.
Most probably there is some execution problem. Please check you MetaTrader log for errors or warnings.

Most probable reasons are:
- using a time frame that doesn't have Bar Closing at the chosen time
- the broker closes earlier on Friday
- the broker suspends the trading around midnight for rollover.

yes it does trade till 23:56
I use selv collected  broker data
the trading hours are
daily : 00:01 – 23:59        here the FSB backtest uses 23:58 for day closing
friday 00:01 – 23:57         here the FSB backtest uses 23:56 for day closing on friday and week closing

I have checked the Mt4 log and there was no closing attempt visible.
I will check again tonight both demo and live account.

Could you see for your self and open a IC Markets MT4 terminal and put a m1 Day Closing EA with no other exit rule  and check?

ok I have checked week closing 2 with 23:56 in MT Backtester and it triggered a  close
also day closing 2 with 23:58 and friday 23:56 triggered close

but with day closing 2 or week closing 2 no additional exit logic can be selected in builder.

and since the exit times from day closing 2 and day closing regular and week closing 2 and regular are the same I think that I could use normal day close and week close plus additionally the exit logic.

with the trading hours from the broker even the standart dayclose/weekclose  should work right and why it doesent? manually I can close at 23:58 and 23:56