While implementing the LiveView rendering LiveView capability in LiveView Native I've had to add the LVN ClientProxy when a child LiveView is being connected to the connect_parms of _format and _interface from the client need to be added.
I'm actually not certain if it would be connect_params or params in LVN Core but similar to how we send the _format and _interface params when establishing the LiveView socket connecton it should use the same params for child LiveView socket connections