Can not turn on/off a Shelly EM from a scene

Hi,

I have multiple Shelly EM devices. I can turn them on/off in scenes except one of them. I don't manage to see what prevents this.

They are all updated with the last firmware and the setting are identical.

I have also rebooted the device and would like to avoid a Factory reset.

Any idea?

I noticed that if I use the second instance of the Shelly EM, it does turn on/off.

I am not sure if this is a intended behavior: that one can only turn on/off one of the the instances of a Shelly EM.