Fail to compile Marlin for SKR mini e3 v3

[maxgerhardt]

This was already discussed.

Marlin Firmware not compiling in VS code

Already discussed in Marlin: RuntimeError: deque mutated during iteration: - #9 by maxgerhardt, please open buildroot\share\PlatformIO\scripts\creality.py in line 5 and replace for define in env['CPPDEFINES']: with for define in env['CPPDEFINES'].copy(): This is a regression because you’re using a very new PlatformIO core to build an old Marlin firmware. Python + SCons behavior has changed.