neopixel-thirty-bug-repro-7.py is likely to eventually produce a 030 (DEVICE_HEAP_ERROR) on a micro:bit v2 perhap after 4-50 hours of running. It will do this without any WS2812 RGB LEDs attached, as expected.

This is on MicroPython v1.18 on 2023-10-30; micro:bit v2.1.2 with nRF52833.

Worth a second check but I don't think it has any memory leaks in the python code.

Some discussion about this in #227

I see one old issue which had unexplained 030 errors: #191