when they died the only thing that appears are the items, not the body (clay soldier item) its this a bug? or its from an update?, because if this is from and update, then he should remove the clay ability to revive the dead ally soldiers

That's not what he meant, he meant the clay soldier item itself getting dropped rather than just their gear.
I.E. when a clay soldier dies, you can't pick up their body and put them back in battle again.

They never dropped their body in a fancy death animation. They only ever dropped items.