theming broken?

Am I an idiot or is theming completely broken? I cannot set or modify any themes besides enabling/disabling the Material You theme.

I had created a custom theme prior to the 0.2.1 version and had been using it since then. I just went in to try to modify the theme and cannot save any changes. I modify specific colors and click the checkmark in the upper right and the changes are not saved, as when going back in to edit the theme, the colors are back to what they were prior to me trying to do the edits.

Also, I cannot change to any other theme besides material you. Where are you supposed to be able to actually select the theme for light, dark, and amoled? The only way I can figure out how you might change the theme is clicking the + beside the theme in the manage theme menu and clicking on set to X theme. This then doesn't do anything.

I enabled the material you theme and then clicked apply, and then under customization there is listed light theme, dark theme, and amoled theme with material you listed below. But I can't modify these or change to different themes after disabling material you. I can go delete material you themes in the manage themes and these go away under the customization menu, and now the theme is back to the default indigo dark, and there doesn't seem to be anyway to change the theme except to the material you theme.

I also get occasional crashes when in "edit theme" and trying to flip the set as X theme.