Copycat WE fix

Note: This mod is a purely client/server patch that fixes rotation bugs. It is 100% legal, doesn’t redistribute the original .jar, and is fully compliant with the ARR license since it only injects code via Mixins. Requires the original Copycats+ to work!

Copycat WorldEdit fix

If you’ve ever used WorldEdit’s //flip or //rotate on a build that uses Create: Copycats+ blocks, you’ve probably noticed something frustrating: the copycat block itself rotates correctly, but the material inside it (the block it’s disguised as) keeps pointing the old way. For multi-part copycats like copycat_byte, copycat_byte_panel, copycat_board, copycat_slab, and copycat_half_layer, it gets even worse — the materials end up in the wrong corners, faces, or halves. This mod fixes that.

The mod:

• ❌ Does not modify non-copycat blocks (signs, banners, vanilla blocks).
• ❌ Does not change how Create’s own schematics work.
• ❌ Does not add any commands or config — install and forget.

Known limitations

• //flip U (vertical flip) works perfectly for copycat_byte (the 8-corner block). For other copycat types with vertical orientation, the inner material may not flip correctly due to Minecraft’s lack of a vertical mirror. In that case, use //rotate with horizontal axes instead.
• All horizontal flips (//flip N, S, E, W) and all //rotate commands work correctly.

Requirements

• Minecraft 1.21.1
• NeoForge 21.1.0+
• Create 6.0.0+
• Create: Copycats+ 3.0.0+
• WorldEdit 7.3.0+ (optional — the mod just does nothing if WorldEdit isn’t installed)

Maybe you should know:

Q: Does this work with Create’s schematics / schematicannon?

A: This mod only affects WorldEdit. Create’s own schematics system already handles copycats correctly (which is why the Copycats+ maintainer recommends it). If you use Create schematics, you don’t need this mod.

Q: Will this break my existing builds?

A: No. The mod only runs when you //paste with a flipped/rotated clipboard. Your existing builds are untouched.

Q: Does it support //flip U (vertical flip)?

A: Yes, for copycat_byte. For other copycats with vertical orientation, results may be imperfect due to Minecraft’s lack of a Y-axis mirror.

Q: I’m a server owner. Do my players need to install this?

A: No. This is a server-side mod. Install it on the server only — players don’t need it on the client.

Q: Will this get merged into Copycats+ itself?

A: Probably not. The Copycats+ maintainer has officially declined to add WorldEdit-specific fixes, recommending Create’s schematics system instead. This mod fills that gap for users who prefer WorldEdit.

Found a bug?

Please report it on GitHub Issues with:

1. Minecraft / NeoForge / Create / Copycats+ / WorldEdit versions.
2. Steps to reproduce (what you copied, flipped, pasted).
3. Screenshots of the wrong result.
4. The latest.log file from after the bug occurred.