Hi guys. Same issue I faced and the solution proposed in this forum worked! I recently got my MacBook Pro 2019 model only a few days ago and had first shut down on 56%. Tried a couple other things but did not resolve issue. I found this thread and together with Apple Support, it’s the same recommended solution: plug in and charge MacBook once battery level is under 90%. Close MacBook and leave charging for 8 hrs or so (I left longer than 8 hrs and seemed fine). Today I successfully drained the battery down to 4% and just plugged it back to re-charge after. All great now. So happy!