Issue Description:

I was trying to apply the Damage Bar upgrade to a Storage Emphasis Diamond Backpack. The usual method of crafting them together didn't work.

What happens:

There is no crafting output for the backpack and the upgrade together

What you expected to happen:

The items combine into a backpack with the upgrade equipped.

Steps to reproduce (important):

1. Craft a backpack (I used a SE Diamond one)
2. Craft an upgrade (I used the damage bar one)
3. Attempt to craft them together
4. Note the lack of output for the crafting.

Affected Versions (Do not use "latest"):

• IronBackpacks: 3.0.5-6
• Minecraft: 1.12.2
• Forge: 14.23.2.2613
• Other Conflicting Mods (may be irrelevant to your issue): None that I know of

Tested with all backpacks with all 4 upgrades, no cigar.

Anvil

Ah. Was not aware. My bad.