Horse limbs detach from body when rearing up

Horses have limb pivots in the wrong place, causing their animations to look broken.

To reproduce, simply use a saddle on an untamed horse and look at its legs.

Expected result

Front legs swing from center point, remaining fixed inside the body

Back legs rear back slightly

Observed result

Front leg pivot is misplaced, resulting in the leg disconnecting from the body

Back legs do not move at all, resulting in the legs disconnecting from the body

The tail is also different, but this appears to be intentional