Help Obi rope with Photon Fusion 2 disconnects from attachment

[Paul1]

I need to spawn objects in runtime, so everything needs to be a prefab. When creating a scene, I instantiate obi rope and spawn 2 plugs, that I can pick up, I connect them to the rope and that is it. On host: Everything works fine, on client: rope gets disconnected from plug and starts to do some weird movement. That only happens when everything is instantiated in runtime.

SimulationBehaviour code:

Code:

bool first = true;
public void OnPlayerJoined(NetworkRunner runner, PlayerRef player)
{
    if (runner.IsSceneAuthority)
    {
        if (first)
        {
            runner.Spawn(prefab, new Vector3(1, 0.089f, 0));
            runner.Spawn(prefab, new Vector3(-1, 0.089f, 0));
            first = false;
        }
        runner.SetPlayerObject(player, runner.Spawn(playerPrefab, new Vector3(UnityEngine.Random.Range(-10, 10), 1, UnityEngine.Random.Range(-10, 10)), inputAuthority: player));
    }
}

plug code (there is more code, but for this question, this is the important part. Parent is in main project something else, this is just for testing):

Code:

Transform parent;
Rigidbody rb;
private void Start()
{
    parent = transform;
    rb = parent.GetComponent<Rigidbody>();
    if (a.Att1.target == null)
    {
        a.Att1.target = transform;
    }
    else
    {
        a.Att2.target = transform;
    }
}
public void Pickup(Transform hand)
{
    rb.isKinematic = true;
    rb.useGravity = false;
    parent.SetParent(hand);
    parent.localPosition = Vector3.forward;
}
public void Release()
{
    rb.isKinematic = false;
    rb.useGravity = true;
    parent.SetParent(null);
}

I also set the Time.timeScale = 0 at start of creating the scene, and at the end back to 1.

Here is a video for better understanding of the problem: [color=var(--theme-link-color-hover, var(--theme-secondary-500))]https://drive.google.com/file/d/1P0H2jcFyjb4VeKeQxLUOMf9-ppuZqm9X/view?usp=sharing[/color]