[(1.16.4) GatherData event not firing?]

(Apologies if this is a stupid question, I'm fairly new to modding)

 

For some reason my GatherData event isn't firing at all, everything else is fine and other events are firing. Here's what I've done:

 

And here's the relevant bit of my build.gradle:

 

I've done a search on the console for the debug message but it's not found, and the models aren't loading (nothing in generated/resources).

 

Any help with this would be appreciated, thank you in advance.