matchMainHand Entity Loot Modification doesn't work with modded weapons

[nothingtown]

Minecraft Version

1.20.1

Mod Version

2.13.1

Describe the bug!

Essentially, when using .matchMainHand for entity loot modifiers, the code doesn't work for modded weapons. Example:

This works, and makes a chicken drop a diamond when killed with a diamond sword.

LootJS.modifiers((event) => {
     
     event.addEntityLootModifier("minecraft:chicken").matchMainHand("minecraft:diamond_sword")
     .addLoot("minecraft:diamond")  
});

This also works, and makes the o_horse drop a diamond when killed with a diamond sword.

LootJS.modifiers((event) => {
     
     event.addEntityLootModifier("dragnlivestock:o_horse").matchMainHand("minecraft:diamond_sword")
     .addLoot("minecraft:diamond")  
});

This, however, does not work. The o_horse drops nothing.

LootJS.modifiers((event) => {
     
     event.addEntityLootModifier("dragnlivestock:o_horse").matchMainHand("butchery:bone_cleaver")
     .addLoot("minecraft:diamond")  
});

I also tried it with the Farmer's Delight netherite knife instead of the bone cleaver, and it also didn't work. The KubeJS server log doesn't show any error, nor does it error on reload.

Crash Report

No response

Log

No response

Additions and Modifications

No

Additions and Modifications Description

No response

Did the issue happen in singleplayer or on a server?

Both

[LLytho]

Testing it with just Livestock Overhaul and Farmers Delight and I have no problems. Looks like butchery causing problems here. It also doesn't create a corpse for the modding entity.

[nothingtown]

that's so weird, i can add the items to a .json loot table just fine to different entities. it seems to only be kubejs/lootjs that it struggles with, despite not throwing an error? also, yeah i don't need a modded entity corpse i'm just trying to get the horses to drop a random colored vanilla horse corpse upon death with a cleaver.

i can go ahead and open an issue on the butchery github as well if it seems to be a butchery problem though, thank you for looking into it :)