Lower body bends when using upper body tracking

[albrrt]

I want to apply upper body tracking on a full body avatar, while keeping the lower body visible and free.

In my case, the experience is seated but the player character should be 'standing' / 'floating' in the virtual world.

When I configure the rig to upper body tracking, the lower body bends when the user sits on a chair.

Changing tracking origin type from Floor Level to Eye level doesn't improve anything

How to prevent the movement SDK from controlling the lower body?

The lower body should be free so we can apply IK on the legs.
Currently, the movement SDK overrides any custom IK on the legs.

Thank you

Using v.83.0.0