What happens:

Both of the Golden Apples get renamed

What you expected to happen:

Only the shiny one gets renamed

Script used

<minecraft:golden_apple:1>.displayName = "Mystical Apple";

Affected Versions (Do not use "latest"):

• Minecraft: 1.12.2
• Forge: 14.23.5.2854
• Crafttweaker: 4.1.20.582
• Using a server: No
• If yes, does the client have the exact same scripts?

If the items use the same translation key (which they do), there is nothing that can be done on the global scale. Not even with a resource pack.

Argh, alright then. I was hoping it'd be fixable.