How can I make the Unity On-screen Stick move only on the X axis? (Unity 2D)

Question

I'm trying to make a movement system for mobile phones in Unity 2D using Unity's On-screen Stick from the new Input System, but I'm facing a problem doing so.

This is the default code from it:

public void OnDrag(PointerEventData eventData)
        {
            if (eventData == null)
                throw new System.ArgumentNullException(nameof(eventData));

            RectTransformUtility.ScreenPointToLocalPointInRectangle(transform.parent.GetComponentInParent<RectTransform>(), eventData.position, eventData.pressEventCamera, out var position);
            var delta = position - m_PointerDownPos;

            delta = Vector2.ClampMagnitude(delta, movementRange);

            ((RectTransform)transform).anchoredPosition = m_StartPos + (Vector3)delta;

            var newPos = new Vector2(delta.x / movementRange, delta.y / movementRange);
            SendValueToControl(newPos);
        }

instead of delta = Vector2.ClampMagnitude(delta, movementRange);, I replaced it with

delta.x = Mathf.Clamp(delta.x, -movementRange, movementRange); 
delta.y = Mathf.Clamp(0, 0, 0);

but for some reason, if I drag the joystick to the end, the sprite won't move and only if I position it in a specific way it'll move.

Hopefully, someone can give me some suggestions.