The pupil movement behavior is different between conventional IK and 2.0 IK.

With IK 2.0, if the head is close to the ground (like in a prone position), the pupils will try to look upwards, and this cannot be disabled. If you revert to traditional IK, you will be able to face the front correctly.

I know there are few users like me who are active close to the ground, but I hope this can be improved so that I can face the front.