namespace:path formatting?

[hinoxeyes]

Mod loader

Forge

Minecraft version

1.20.1

Patchouli version

v8.4

Modloader version

Forge 47.2.0

Modpack info

No response

The latest.log file

Issue description

I'm having trouble changing the name of an item as it appears in a book im making for my modpack, the website page 'ItemStack String Format' suggests:
namespace:path{nbt} (e.g. "minecraft:diamond_pickaxe{display:{Lore:['A really cool pickaxe']}"
But even when copying this exact example, the book has a loading error.
I've implemented plenty of enchantments and other nbt values, but this one is giving me trouble, any ideas?

Steps to reproduce

No response

Other information

No response