Greek God
When you activate approach the final target speed i.e. Vapp is displayed in magenta(if managed). It is much the same when SRS changes to CLB/OPCLB the target speed 250 in magenta is displayed. Perhaps since there is no reason to hold on to flaps the speed keeps increasing and you keep retracting and when clean 250 will be maintained. On approach it is the other way round but the speeds are held at S or F to give you option of holding on to it.