dissappearing leads

leads disappear on death of animal leashed
What I expected to happen was...:
my pig who I leashed would die and drop the lead

What actually happened was...:
The pig died and dropped pork chops, but no lead

Steps to Reproduce:
1. leash animal
2. kill animal
3. note lead does not drop

I am not sure if the lead is supposed to drop from leashed animals, but I know saddles do, so I figured leads are supposed to as well.