We have fixed this issue in the upcoming PlatformIO Core 6.1.8. Nevertheless, we also published PlatformIO Core 6.1.7 as a “wheel” component to the PyPi registry. It should fix the issue.
Could anyone in this thread remove back the fix “Win32 long paths” which you applied before? Also, remove C:/Users/%USERNAME%/.platformio folder. Restart VSCode.
Does it work now?