with your mod installed installed anything that takes iron+ (tried redstone, diamond and game lapis even with a diamond and netherrite pick) to break will break and give xp but not the ore. anything that can be gotten with a lesser pick and the ores from the mod work perfectly

https://youtu.be/Qe8kYr0eihw

I am using forge 41.0.38 if that matters

KrystalCraft-0.0.3.1-1.19.2.jar requires version 1.19.1 to run

this tag doesn't seem to exist. in EMI the recipe shows as this but then it can't be crafted

Minecraft version: 1.19.2
Forge version: 43.1.3
KrystalCraft version: 0.0.3.3

The latest version of KrystalCraft returns a loading error with the latest versions of Forge and Minecraft.

Crash Report:
https://gist.github.com/Gamemassa/6419df689a6d46b524ba56a882204c67

Your cleanup gradle commit 64a7f9c removed the line jar.finalizedBy('reobfJar') , unless you build via reobfJar your built jar isn't getting reobfuscated for usage in a non Development Environment.

This can be seen in your latest release https://www.curseforge.com/minecraft/mc-mods/krystalcraft/files/4574480.
Trying to run this in a normal Minecraft Client will result in a
java.lang.NoSuchMethodError: 'net.minecraft.world.level.block.state.BlockBehaviour$Properties net.minecraft.world.level.block.state.BlockBehaviour$Properties.of()'
due to the lack of Reobfuscation.

Also in the same commit your changed to not using fg.deobf for your Mod Dependencies, this is actually required.
https://forge.gemwire.uk/Dependencies#Deobfuscating_Dependencies