Should be fixed in cups-filters 1.0.40 and later:
[...]
CHANGES IN V1.0.40
- pdftops: Introduced new "hybrid" renderer: Here usually
Ghostscript is used, but if the printer is a Brother,
Minolta, or Konica Minolta Poppler's pdftops gets used. This
is a quirk rule to work around bugs in the PS interpreters
of the printers.
[...]
Till