My 2019 Touring only gains EV range on a downhill or under braking if it is showing some EV range already. If it is at zero and/or has two bars on the gauge, no matter the length or steepness of the grade, it won’t build range. If I hit the crest of the same hill with SOME range it will build 3-4 Mike’s and a bar or two of range on the way down. (This is a five-mile, steep downhill). Normal? If so...why?