I'm pretty sure this is intentional. I seem to remember reading that cyclical charging/discharging is a feature of the operating system to increase battery life.
The only reason I recall that is that I recall thinking how much I hated the phone I had that did this, when I read about the Pinephone doing it. There's nothing more irritating than charging your phone overnight and having it at 50% when you need it in the morning.
The only reason I recall that is that I recall thinking how much I hated the phone I had that did this, when I read about the Pinephone doing it. There's nothing more irritating than charging your phone overnight and having it at 50% when you need it in the morning.