The 1.15.2 versions have broken loot tables for ores and an ability to break the mod ores with any pickaxe.
The second one is a bug in Fabric API which I cannot control. As such, I won’t support the 1.15.2 versions anymore. If you’re already using Fabric, why not update to 1.16.1 as it comes out?
This mod adds to new materials to Minecraft, Catium & Eggplantium. There are two versions of the mod. The normal one, and the "Common Ores" one. In the Common Ores version, the two ores are very very very common.
OK.
Use Fabric, not Forge.