'Wind' feature within running power calculation

Two questions on Garmin Power, using the wind adjustment feature:

i) Does anyone know if, when calculating power while taking into account the wind strength, whether the calculation takes into account the percentage of time spent running "in to" the wind vs "with" it ? i would have thought the adjustment is pretty pointless if it just takes the wind speed (regardless of direction) and simply bumps the power up by a flat percentage, regardless of your direction of travel.

ii) i noticed the wind speed disappeared from the map shown in workouts in GC, around the same time i enabled the Power calculation. Is that a coincidence or is it linked..?

Thank you vm.