So far in my testing they have

• dropped solidified experience from Actually Additions
• dropped loot bags from Loot Bags (see issue #257)
• granted experience to living armor from Living Enchantment when slain by the player wearing such armor

Loot farming clay soldiers is sort of lame.

Do you use Java 8? Yes
What version of Minecraft do you use? 1.12.2
What version of MinecraftForge do you use? 14.23.5.2836
What version of SanLib do you use? 1.5.1
What version of Clay Soldiers do you use? 3.0.0 beta 1.1