I second the problem with 440.20. I did comment on issue (#174 on github.
I don’t necessarily use Fusion 360 to generate my gcode. I do use other tools like makercam or pcbgcode for eagle as well.
G2/G3 moves should be working to have a reliable machine :-/
I read about the issue on separate sources but didn’t find the answer for the question: Did the problem with G2/G3 ever got solved and if so, which firmware version shall i use?
Maybe someone can clear things up. I guess i’m not the only person on the planet who got this issue.