PL 9 (Mac) can be set to remember 250 steps in the “Advanced History” panel.
Earlier versions had a limit of 500 steps.
Switching an older PL from 500 to 250 launches a popup saying that the excess steps will be deleted for good (see screen image below)
Using PL9 never asked about this and I must assume that PL9 silently cuts off entries that might still be needed, e.g. in case of fallback.
If you set PL 8 and before to remember 500 steps,
I advise you check your history panels.
No need to respond if you don’t care about the topic.
