Bug description
When players die wearing a MWC custom backpack or vest, the backpack or vest will be dropped on the ground and will despawn.

Steps to reproduce the issue

1. Wear a backpack or vest
2. Die
3. Observe

Expected behavior
Backpacks an vest placed into the corpse inventory

Log files
N/A

Versions

• Minecraft version - 1.12.2
• Forge version - 14.23.5.2859
• Mod version - Newest

Other mods
Happens with just Corpse and MWC

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