Entries and Categories not showing up on the book

[InterPlay02]

Mod loader

Forge

Minecraft version

1.20.1

Patchouli version

vazkii.patchouli:Patchouli:1.20.1-84-FORGE:api

Modloader version

Forge 47.2.0

Modpack info

None

The latest.log file

None

Issue description

I'm making a mod and I have made what they told me to do on the wiki and my book is working correctly.
But, for some reason, when I try to create new entries and categories, they are not showing in my book.
No error messages appear.
They simply are not being shown on the book.
This is how I have the entries and categories setup:

This is what I have inside:

{
  "name": "Test Category",
  "description": "This is a test category for testing!",
  "icon": "minecraft:writable_book"
}

{
  "name": "Test Entry",
  "icon": "minecraft:writable_book",
  "category": "apocalypticevents:test_category",
  "pages": [{
    "type": "patchouli:text",
    "text": "This is a test entry, but it should show up!"
  }]
}

But, look... they are not showing on the book:

What could it be, and what should I do?

Steps to reproduce

None

Other information

This is what I have on my book.json:

{
  "name": "item.apocalypticevents.ancient_boundaries",
  "landing_text": "item.apocalypticevents.ancient_boundaries.desc",
  "version": 1,
  "creative_tab": "minecraft:tools_and_utilities",
  "use_resource_pack": true
}

This is what I have on my lang file:

{
  "item.apocalypticevents.ancient_boundaries": "Ancient Boundaries",
  "item.apocalypticevents.ancient_boundaries.desc": "This book was writen by someone who was what I am now."
}

This is what I have in the gradle.build:

minecraft {
    [...]
    runs {
        [...]
        client {
            [...]
            property 'mixin.env.remapRefMap', 'true'
            property 'mixin.env.refMapRemappingFile', "${projectDir}/build/createSrgToMcp/output.srg"
        }
    }
}

repositories {
    maven { url 'https://maven.blamejared.com' }
}

dependencies {
    minecraft "net.minecraftforge:forge:${minecraft_version}-${forge_version}"
    compileOnly fg.deobf("vazkii.patchouli:Patchouli:1.20.1-84-FORGE:api")
    runtimeOnly fg.deobf("vazkii.patchouli:Patchouli:1.20.1-84-FORGE")
}