Stackble dark backhoe empower module duplication

[nullmana]

Issue Description:

Two dark backhoes with identical durability can be stacked, and any module inserted into the stack (eg, empower) will be duplicated when the stack is split

What happens:

Item duplication

What you expected to happen:

Dark backhoes should not stack

Steps to reproduce:

1. Craft two dark backhoes
2. Insert any module (eg empower) into the stack
3. Split the stack
4. Take duplicated modules out of the two backhoes

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Affected Versions (Do not use "latest"):

• EnderIO: 5.3.70
• EnderCore: 1.12.2-0.5.76
• Minecraft: 1.12.2
• Forge: 14.23.5.2855
• SpongeForge? no
• Optifine? no
• Single Player tested

Your most recent log file where the issue was present:

No crash, so no log file

[pastebin/gist/etc link here]