When I was using the 1.17 version of ExtraOrigins, I used a datapack to tweak one of the powers for the Floran. That datapack no longer seems to work in the 1.18 version of the mod. I've checked multiple times that the datapack was constructed correctly and that the JSON file was correct.

Below is the datapack that I'm trying to use:
extraorigins-tweaks.zip

Do you mean it fails to load or is nonfunctional? It loads fine for me

The datapack loads, but appears to be effectively nonfunctional (i.e. I'm not noticing the expected change).

You need to put the loading_priority field inside the sub-powers

I already tried loading_priority. It's at the top of my datapack but it doesn't seem to affect anything.

use priority_loading

Assuming fixed, but if not then there's nothing I can do about this anyway. I have no control over loading, that's handled by vanilla Origins