spacemacs-theme-custom-colors regression?

I updated spacemacs and my custom spacemacs-theme-custom-colors seem to have reverted. I have: ``` (custom-set-variables '(spacemacs-theme-custom-colors '((bg1 . "#000000") (comment-bg . "#000000") (act1 . "#000000")))) ``` But the background went back to the more default dark grey.