Building for CPX from main as of today, I found when I load the firmware onto the Circuit Playground Express, over half the LEDs light up when no code is running. The only way to get them to turn off was to put a pixels.fill(0) in a loop (including it at the beginning of the code was not enough). When there is LED code running, it still flashes the same LEDs as when no code is running on quickly before running the LED code.

@jepler evidently ran into a similar issue on PyGamer.

Image attached.