Observed in backtest.
Clocks in the UK go forward 1 hour on the last Sunday in March and back on the last Sunday in October (observe the entry/exit hours before and after the position I am discussing). This seems to have broken this position which opened before the March change and apparently did not meet exit/tp/sl criteria for another 4 months, despite the strategy’s ~1d average exit time. Changing the strategy’s tp also has no effect on the time or profit that this position closes at.
Bonus bug: the generator named this strategy cocky nightingale, then censored it when I saved it, which I found pretty funny.