From my poor understanding of development and C/C++ I really think there is something very wrong with the definition of the ATMega4809 in the platformio files, or I have missed a step regarding what to use as a target ?
So I’ve tried another tweak, I have tried to compile for Arduino Nano Every explicitely in PlatformIO ( not selecting ATMega4809 ) but in the end, the ini file is the same, and so does its behaviour… it is still not recognizing any of the specifics for that hardware.
I’m really thinking there is an issue with the definition of that new Arduino/4809 board that does not come from Adafruit nor my own code since both compile in Arduino IDE and not here, and since less recent targets in PlatformIO do accept the code.
Any further view on this ?