Amulet of Sacrifice deletes whatever other amulet you are wearing upon use

[TheMingo888]

To reproduce:

1. Wear an amulet of sacrifice, and kill some hostile mobs
2. Replace the amulet with a soul pendant in baubles
3. Use the amulet of sacrifice on a blood altar
4. The amulet of sacrifice will delete the soul pendant and replace itself in your baubles slot

Presumably, this will happen regardless of what is inside your amulet slot, and will also occur with the amulet of self sacrifice (though I have not tested this).