So the undead rares that spawn from killing the small pack of mobs just isn’t targetable and not interactable at all. Sucks cause I really wanna get the risen mare mount.
Targeting mob types for loot has been gone for a long time now. It doesn’t matter what you kill. Again it does not matter What mobs you kill, heck you could even go pacifist and just loot Azerite.
What matters is what mob types are spawned upon entering and during the expedition.
As a side note, farm the doubloons and just buy the boxes that contain the mount you’re after, the drop rate is much much higher.