Aquarium Tutorial : Coral Instantiate seems to return Null : no objects spawned

[ian57]

Hi,

Testing the aquarium tutorial (Unity 2021.3.25f1, VS 2019) with Hololens2, when I try to experiment the "CanvasButtonBar" adding Spawner to the Coral button, nothing happens in the play mode. No error in unity. Button is well configured as described in the tutorial

I tried to debug through VS and saw that the Instantiate method

 public void SpawnCoral()
    {
        Vector3 position = new Vector3(.19f, 0, .7f);
        Instantiate(coral, position, Quaternion.Euler(0, 180, 0), parent);
    }

is doing nothing. Did I miss something?