Do you use Java 8?
yes

What version of Minecraft do you use?
1.12.2

What version of MinecraftForge do you use?
Forge Version Number

What version of SanLib do you use?
1.5.1

What version of Clay Soldiers do you use?
3.0.0-beta.2

What is the issue / bug you have encountered? Give us a short description.
Shear blades whether they are held in the main hand, offhand, dual wielded or upgraded with prismarine shards will ignore diamond and gold upgrades and always have 25 durability, making them less useful for kings or diamond soldiers.

How can it be reproduced?

1. give a soldier diamond/gold upgrades, and a shear blade
2. let it fight and count how many times it gets used before breaking