Minecraft Version

1.20.1

Mod Version

2.12.0

I am trying to modify the loot tables of blocks from Better Nether and Better End, but for some reason it does not work with those mods. There's a good chance the problem is on their side, but development seems slow over there so I was hoping to see if there's a workaround. This does not work, but I think should:
LootJS.modifiers((event) => { event.addBlockLootModifier("betterend:thallasium_ore").addLoot("minecraft:flint"); });

Feel free to close the issue if there's nothing that can be done on this side of things.

Crash Report

No response

Log

No response

Additions and Modifications

Yes

Additions and Modifications Description

Here's the modpack in question, although I think the only relevant mods are KubeJS, LootJS, BetterNether, BetterEnd, and BCLib.
https://www.curseforge.com/minecraft/modpacks/minecraft-ultimate-rpg-edition

Did the issue happen in singleplayer or on a server?

Singleplayer

It is an issue on their end. They hardcode the drop. There is no loot table for the ore.