Can’t find nightmare warepig anymore

So we fought him and killed him once around day 700 and then killed the scrappy one about 4 times withought killing the nightmare version again and when we go look or nightmare he’s not in the same spot in the caves no pillars we have looked everywhere and have done fuelweaver to see if that would reset him but no does anyone know what I can do (ps5) it’s day 1050 now