Warm and cold pig textures lack nipples, making them inconsistent with temperate pigs

The new warm and cold pig variants introduced in 25w02a lack the 6 nipples on the underside of their textures, which is inconsistent with the texture of the original temperate pigs.

As seen in the attached image, the rightmost pig, the temperate pig, has 6 darkened pixels on its underside meant to represent nipples, yet the two variants on the left lack these pixels