M5's APIs tend to be quite buggy. I've come across a few such as flicker caused by running the wifi on the main CPU core that's controlling the display, or RGB component order being reversed despite the ESP32 spec for their own hardware, or refusing to combine APIs for similar products (e.g. Core 1/2) resulting in multiple similar APIs and multiple imports/build configs/macros to support many of their devices at once from a single code base. Hopefully Espressif will start lending their expertise as their documentation and software has been first class.