When using this script:

import crafttweaker.api.item.IItemStack;
import crafttweaker.api.item.IIngredient;
import mods.zensummoning.SummoningDirector;
import mods.zensummoning.SummoningAttempt;
import mods.zensummoning.SummoningInfo;
import mods.zensummoning.MobInfo;


SummoningDirector.addSummonInfo(
    SummoningInfo.create()
        .setCatalyst(<item:minecraft:bone>)
        .setReagents([<item:minecraft:leather>*2,<item:minecraft:beef>])
        .addMob(MobInfo.create()
            .setMob(<entitytype:minecraft:illusioner>)
            .setOffset(1,2,1)
            .setSpread(1,1,1)
        )
);

it does not get loaded in, but replacing "illusioner" with "zombie" does work

What the heck? It works, just does not show in JEI when its the illusioner.

I think the way I upgraded the spawn egg code for the recipe might prevent stuff from working if the entity doesn't have an egg. In previous versions, you could hack the egg to be anything, but it's a little different now. Will try and make sure there's a fallback

haven't tested myself yet, but you aren't on peaceful right?

I meant the JEI recipe doesn't even show up

New build will be available here once approved