No natural snail spawns. Spawn eggs working, snails spawned from spawn eggs work. Used teleport commands to check multiples of each biome listed as a spawn area. Running mod version 1.0.3 in MC 1.17.1 with Fabric 0.11.6 and the following mods: Arcanus, More Axolotl Variants, Expanded Storage, AppleSkin, Architectury API (Fabric), Artisanat, Axolotl Bucket Fix, Cloth Config API (Fabric), Comforts (Fabric), Companion bats, Complete Bone Meal, Dawn API, Fabric API, Gecko Lib, Infinity Fix, Lapis Reserve, Linked Storage, Mythic Mounts, Nature's Compass, Rat's Mischief 🐀, REI, Slimy Floor, Terralith ~ Overworld Evolved, When Dungeons Arise.

My mistake, was just incredibly unlucky in the first three worlds i generated.