Question IK Setup Overrides all other animations

I followed the IK setup documentation and to my surprise it actually worked! Head tracking looks really good.

Unfortunately at the same time it seems like all my other animations are being overridden, this happens as soon as I assign an Avatar to my animation controller.



As you can see I have a simple animation tree with IK active and a mask. I've tried setting the whole mask to red and green, but it hasn't made a difference. (Yes, I've tried changing Override to Addittive with no results )

My character spaws half in the ground


Versus how he should actually look



I've noticed the pose he spaws in is the same as the one in the "Muscles and Settings" tab when setting up the avatar:


But I'm not entirely sure what this means....

There's very little actual logic to it. The only script is the IKControl.cs script from the docs with just a

LookObj

set.

Any idea what I'm doing wrong?