Please try the suggestions made by @Compusmurf . If the issue persists, please send us an error report. We apologize for the inconvenience and appreciate your contribution to the beta program.
One UI Beta Team.
I've realized that fast charging only works with older samsung bricks. I know exactly what you're talking about. we should be able to turn off super fast charging and it should just fast charge but no, it doesn't. it will only cable charge. This been a problem since day 1 getting the phone. I even swapped out my phone for a new one and still the same problem. He's referring to the fast charge which isn't working and he's right. I should be able to set fast charge with the new power brick, not use my old one from other samsung phones just to use fast charging.