Steps to reproduce:

1) Make sure the Headshot Morph Slider Package is installed.
2) Load any base character (e.g., Neutral_M).
3) Navigate to the slider "Head Back Forward" under Headshot → Neck → Rotate.
4) Open the mouth manually or load a facial animation for better visibility (e.g., Motion → Facial Rig → Mouth, around frame 1180).
5) Move the "Head Back Forward" slider back and forth and observe the issue. (video with issue is attached)

Issue:
When using the "Head Back Forward" slider, the upper teeth rotate unnaturally along with the head. I assume this rotation is unintended. It would be great if this could be fixed, especially since this is the only slider that moves the entire head backward and forward.

Technically, the teeth position can be corrected using the dedicated teeth sliders. However, this method is not only tedious but also inaccurate, particularly when working with symmetry. As a result, the usefulness of the "Head Back Forward" slider is significantly reduced.