Mod cnb requires geckolib3 between 3.1.27 and 3.1.39 (inclusive)

For further context, your geckolib version range (not sure why it's locked from the end but that's a question for you, [3.1.27,) is valid toml iirc) excludes the latest version of geckolib, which is 3.1.40.

The error you get on bootup looks like this.

This was intentional, done to exclude any potentially breaking changes that could be introduced. Furthermore, 1.19.2 was meant to be unsupported, and therefore not receiving more updates. I'll make the bound for 4.0 exclusive!

Fixed by 39c6e0c