I noticed when having The Aeather mod installed and create enchantment addon, something about the Aeather mod changes the XP behaviour so it doesn't drop as nuggets anymore. This is on Fabric. 1.20.1 all files to date. Checked the config for the enchantment add on to make sure its still set to true for deployers dropping xp. But yeah, only way to get the nuggets to drop again is to remove the Aether mod

Have you ended up on the wrong github repo? This isn't for the Aether mod, this is for the worldgen library mod Lithostitched.