User here noticed that OneWire is not working on ESP32-S2: https://forums.adafruit.com/viewtopic.php?f=19&t=187286

Two problems:

1. Open drain outputs not working: Open Drain outputs don't work (also breaks bitbangio.I2C) #3845. I have a simple fix for this.
2. Onewire times seem to be somewhat too long. Still researching that.