Bug? Framing Transposer not recognizing Target Group until I remove reference and then add reference

Unity Engine
,
1

I have a Framing Transposer whose follow is a TargetGroup. However, when I press play, all the “Group Framing Mode” settings and below all disappear, as though I were following a normal transform and not a TargetGroup. Making the follow null and then re-referencing the TargetGroup fixes it. So what I have right now is this bit of code, which works as a workaround for now:

    public CinemachineVirtualCamera vcam;
    public CinemachineTargetGroup targetGroup;

    private void Start()
    {
        vcam.Follow = null;
        vcam.UpdateCameraState(Vector3.up, Time.deltaTime);
        vcam.Follow = targetGroup.transform;
    }

Is this a bug, or is there something I might have wrong in my setup?

I’m on Unity 2020.2.4f1 and Cinemachine 2.6.3

2

That sounds like a bug, but I’m not able to reproduce it.
Can you send me a simple project that reproduces this issue?