So if you work at noon and your car is sitting outside you will have to use extra juice before you leave to warm up your battery since it would have gone dead cold again. So that is not very good as a citizen. It might be great for people living in a warm climate with high rate during the day. Obviously, one should be able to adjust the time charging stops.Even if the electricity rate don't go up at 6 AM for you, that's generally when the electricity USAGE starts peaks, wherever you are. Stopping the charging at 5:55 is just being a good citizen, especially when the temperature is extra cold.
I think that the developper purely screwed up which is too bad since the principle of scheduled departure is excellent.
I am ready to bet that it is going to be improved in a next update though.