In the pack I'm working on, I'm including an akashic tome with every guide book in the game already included. I've added a recipe, made players start with it in their inventory on world creation, and forced it to appear in JEI.

The book is renamed to the Universal Guide. When the player turns it into a guide book and back, this name is lost.

I need confirmation that this is still happening in version 1.20

Got confirmed and will be fixed for 1.20.1

Duplicate of #9, pretty sure

It's caused by the same issue. Morphing the book deletes all NBT data.

Oof, it even strips Armourer's Workshop skins off it.

Anyway, my current recommendation if you want the book to be renamed is to include a resource pack that changes the relevant translated name in the en_us.lang file. To do this, include the folder structure assets/akashictome/lang/ and inside that lang folder include a modified en_us.lang file. Include relevant pack.mcmeta and a pack.png file in the root folder, and ZIP it up. This won't solve the other issue I linked to, but it should solve yours.