Followed the steps to reproduce
1. Installed civictheme
2. Build theme assets...

Followed the steps to reproduce

1. Installed civictheme
2. Build theme assets
3. Opened built storybook and observed if the property knobs have disappeared.
4. Did the same for a new sub-theme

visited the storybook on the below build storybook
themes/custom/civictheme_demo/storybook-static/index.html
themes/contrib/civictheme/storybook-static/index.html

Issue No longer exists.