I have the latest software and have been using charge scheduling since my pod point & WiFi had a falling out.
Most nights, after plugging in, I have to go in to the car and change it from charge immediately to charge at preferred time & then it works okay & charges at 12:30 to suit Octopus Go.
A couple of times It has gone into delayed timing mode of it’s own accord, but mostly it just starts charging immediately until I change the setting.
The main thing is that it has always charged at the right time, once I’ve changed the setting.