fabric: In prod, with fabric-content-registries installed, a data pack reload listener doesn't get invoked

How to reproduce the issue:

1. In prod, first install ONLY level-up-hp and open a single player world.
   • search the log for LevellingConfig; it’s there, loaded fine
2. Now, add the fabric-api jar and open a single player world again
   • search the log for LevellingConfig; it’s not there. My resource reload listener was never invoked.

What I’ve observed so far is that when only the fabric-api modules I depend on are installed, it works just fine, but when ALL fabric-api modules are installed, my SimpleSynchronousResourceReloadListener never runs. I confirmed this by removing the fabric-api modules I DON’T use from the fabric-api jar, and then repeating step 2 above. The results were the same as step 1. I’m still working on determining the exact module and root cause. See https://gitlab.com/sargunv-mc-mods/level-up-hp/issues/20 for details.