1. W215 is switched on
2. Remove power for like 1 minute (simulate power failure)
3. Plug back W215
4. Setting is now OFF. waited few mins and is OFF
It might be a safety feature not to have it default ON after plugging in.
But I hope, it should check in the Scheduled Task history that it there is no scheduled OFF setting.
Another limitation is the Mydlink Home App.
There is no option to set "ON at 4:30PM only", then ON again in another xx:xx time. It needs a tandem ON and OFF in when creating schedule