Hello,
After I updated yesterday, I noticed it on /admin/customize/themes/ page.
Every time I go to the admin theme page the Color Palette is on Light (default) and the submit, cancel buttons appears. The submit button isn’t do anything on click.
There is no error in console.
But it seems this is only a visual bug because the color palette is working fine despite what appears and the correct color palette is still set.
Thank you 
