Describe the bug
Killing mobs that are visibly wearing backpacks does not drop any backpacks.

To Reproduce
Steps to reproduce the behavior:

1. Install both Sophisticated Backpacks and Curios
   (Without Curios, backpacks don't visibly show up on mobs for me. I submitted a separate ticket for that issue.)
2. Find mobs visibly wearing backpacks
3. Kill those mobs
4. Receive only regular mob loot

Expected behavior
Killing a mob that are shown wearing a backpack should (at least sometimes) drop a backpack.

Versions
SB version: 3.8.1.386
Curios version: 5.0.1.0
Forge version: 37.0.65

Just retested and they are. it's just a 12.5% chance by default without looting so you can't expect that every single one of them will