Zombie horses and zombie nautiluses count towards the "Monster Hunter" and "Monsters Hunted" advancements while skeleton horses don't

Zombie horses and Zombie nautiluses are considered hostile monsters, meaning they are required for the “montsers haunted” advancement while skeleton horses arent

Steps to produce: kill a zombie horse or zombie nautilus and look at the “monsters haunted“ advancement kill count, then kill a skeleton horse and look at the same advancement

Expected behavior: killing any of the three mobs should make the counter go up

What actually happens: it goes up only when killing a zombie horse or zombie nautilus, not when killing a skeleton horse

that happens because even tho zombie horses and zombie nautiluses are considered hostile monsters, skeleton horses arent

Since zombie horses and zombie nautiluses are considered hostile mobs and so are skeletons then skeleton horses should also be counted as such