For me there are missing grid lines with both /usr/bin/pdftops and /usr/lib/cups/filter/pdftops and /usr/lib/cups/filter/pdftops is a wrapper around /usr/bin/pdftops so in any case Poppler's /usr/bin/pdftops is used.
For me there are missing grid lines with both /usr/bin/pdftops and /usr/lib/ cups/filter/ pdftops and /usr/lib/ cups/filter/ pdftops is a wrapper around /usr/bin/pdftops so in any case Poppler's /usr/bin/pdftops is used.