Auto chisel crashing on custom chisel group

[MuteTiefling]

So I've implemented a chisel group through crafttweaker as shown below. This works wonderfully for regular hand held chisels. However, when I pass it through the auto chisel, it crashes the game.

Version: Chisel-MC1.12.2-1.0.1.44.jar

Log: https://paste.dimdev.org/kaqibiwiza.mccrash

ZenScript:

import crafttweaker.item.IItemStack;
import mods.chisel.Carving as Carving;

//PneumaticCraft Puzzle Groups
var chiselGroupName = "puzzle";
Carving.addGroup(chiselGroupName);
val chiselGroupItems = [
	<pneumaticcraft:programming_puzzle:1>,
	<pneumaticcraft:programming_puzzle:2>,
	<pneumaticcraft:programming_puzzle:3>,
	<pneumaticcraft:programming_puzzle:4>,
	<pneumaticcraft:programming_puzzle:5>,
	<pneumaticcraft:programming_puzzle:6>,
	<pneumaticcraft:programming_puzzle:8>,
	<pneumaticcraft:programming_puzzle:9>,
	<pneumaticcraft:programming_puzzle:10>,
	<pneumaticcraft:programming_puzzle:11>,
	<pneumaticcraft:programming_puzzle:12>,
	<pneumaticcraft:programming_puzzle:14>,
	<pneumaticcraft:programming_puzzle:15>
] as IItemStack[];

for item in chiselGroupItems {
    Carving.addVariation(chiselGroupName, item);
}