Item modifiers that change the item type don't work on entities

The bug

/item entity <targets> <slot> modify <modifier> does not work when the resulting item has a different item ID.

Affected loot item functions

• minecraft:enchant_with_levels (1)

• minecraft:enchant_randomly (1)

• minecraft:set_enchantments (1)

• minecraft:furnace_smelt

• minecraft:exploration_map

(1) Only applies for books

How to reproduce

1. /item entity @s hotbar.0 replace minecraft:porkchop

2. /item entity @s hotbar.0 modify mc-205321:furnace_smelt

   → ❌ Replaced a slot on … with [Cooked Porkchop], but the item is still Raw Porkchop.

data/mc-205321/item_modifiers/furnace_smelt.json

{
    "function": "minecraft:furnace_smelt"
}