Sleeping mob named Dinnerbone or Grumm is not rotated

After naming mob "Dinnerbone" it is rotated upside down (or as it should be, if you ask Dinnerbone), but when villager named Dinnerbone goes to sleep, it is not rotated at all. It should sleep on the stomach with face down (preferred), or with legs in the head of bed (more logic, but less funny).

Also affects Grumm.