There seem to be some PHP errors from setup.php where the color palettes are being added. This seemed to bring the whole site editor down so I couldn't evaluate much further.

As an alternative to adding those color palettes via PHP I suggest instead including them exclusively in the experimental-theme.json file instead. I don't believe there would be a reason in your theme to have them in both locations. As a test I simply removed

 31     $this->editor_font_size();
 32     
 33     $this->editor_color_palette();
 34     
 35     $this->editor_gradient_palette();

from setup.php and things seemed to run OK.

Hi, do you plan to update this to the newest formats?