Spawn Eggs Missing

My apologies if I mess up something or did not follow something correctly. I just made my account for this.

Anyways the spawneggs for Tamed Cats, Tamed Dogs, Wither Skeletons, Strays, Husks, and Elder Guardians are missing. If I spawned a Skeleton in a Ice biome it would appear as a Stray. If I spawned a Zombie in a desert biome, it'd appear as a Husk. I don't know if this is intentional or not considering that the Polar Bear still has his spawn egg.