Describe the bug you're experiencing

So I tried to use this mod for one exact purpose: I want to add 1 singular item into a list of loot tables (spawns with a 100% chance).
I tried following the guide by creating my own datapack with a custom loot table (one block of dirt into two loot tables), but it appears to not work. I really need an explanation because I am new to datapacks and loot tables(

Reproducability

• Add my datapack to the world
• Find a chest (for example, that one in the desert pyramid)
• There is no dirt block (placeholder item) there

loottablefix.zip

Mod up to date

• Before submitting this issue I updated to the newest version and reproduced it

Minecraft version

1.19.2

Modloader version

Forge

Logs

https://gist.github.com/KMDNAR/89fcc47eecf2182fdd675f3858c51794

It is not really a "bug"; I just need help with datapack creation, and it appears to be the only place to find more tutorials/examples.