Game mode: [Singleplayer]
Steps on how to reproduce issue:
1.Capture and tame named thrall Sorschut Eyegouger (archer)
2.Place and guard in the world.
3.View stats and see them all as 0% for potential growth.
The pic I provide shows him with accuracy growth and strength plus damage bonus, but this is because I gave him food. Otherwise he comes with nothing.