It seems like for twist bones to work on the autorig builder, the main axis of the skeleton cannot be the z-axis, even if it is correctly set in the orientation settings. The direction of the upnode for the twist bones is always in the positive or negative z direction, and if that is aligned with joint main axis (facing towards or away from the child joint), the twist bones will not function. Is there a way to change this behavior, and set the up direction of the twist bones?

If you try to use the autorig builder on the capybara test character, you will see this behavior due to the joint orientations on the arms and legs.

Hi, We are missing the pin offset position on the limb Autorig Builder component. It is by default set to (0.0, 0.0, 0.1) like you have said. We should have a fix for that soon.

Thanks for the feedback.