select_related issue

[Krzy65siek]

In setup:

class Printer(PolymorphicModel):
...

class LargeFormatPrinter(Printer):
....

class PrintMode(models.Model):
printer = models.ForeignKey(Printer)

query = PrintMode.objects.all().select_related('printer)

query[0].printer always refer to base class. Am I doing something wrong? Or select_related breaks inheritance?