The bug fixes are released now, see this thread Area Mapping with Phantom 3 Professional - #13 by Chet_Reinike
We don’t recommend using the new and old Hub together. It is likely to cause issues as the old Hub won’t understand any of the new flight properties introduced in the new Hub.
If the finish action is set to RTH, and it lands at the end, it could be that the drone is close to the home point (within 20m or so). Other than that, it should not land at the end, provided there is no bug in the P3S DJI firmware.