Do you use Java 8?
Yes

What version of Minecraft do you use?
1.12.2
What version of MinecraftForge do you use?
1.12.2-14.23.4.2757
What version of SanLib do you use?
1.12.2-1.5.0

What version of Clay Soldiers do you use?
1.12.2.3.0.0

What is the issue / bug you have encountered? Give us a short description.
We can transmute clay soldiers in the Transmutation table of ProjectE Mod
But we cannot take it back, Youll have a Missing texture item, unusable

How can it be reproduced?
put ANY clay soldier in the transmutation table of ProjectE

Please post your log file (either in /logs/fml-client-latest.log or /logs/latest.log) on https://gist.github.com and provide the link: