[Bug] Items added to JEI cannot be hidden. about itemstages HOT 2 CLOSED

Hm, I noticed the item doesn't get dropped either, perhaps I've done something wrong.
Okay, doesn't seem like it's my fault, my best guess is that you can't add a stage to something that requires specific NBT data, that's not entirely great.

from itemstages.

If the item is not dropping it means your NBT is not valid to match that item. Some items will have different NBT on the client or server. The mod includes a test for verifying NBT works, for example

mods.ItemStages.addItemStage("one", <minecraft:enchanted_book>.withTag({StoredEnchantments: [{lvl: 5 as short}]}));

So the NBT feature is working as intended.

from itemstages.