Summary: The shadow of all tetrapods is essentially centered between the legs, except Hoglin / Zoglin. Also parity with java. Since there the shadow is centered between the legs.
Steps to reproduce:
Summon Hoglin / Zoglin.
Look at the location of the shadow.
Observed results: The shadow is not at all centered between pairs of legs. The shadow is centered on the front pairs of legs.
Expected results: The shadow is centered between the hind and front legs.
Affects 1.17.40.20