Tokens reset once the tab is re-selected

[JamesIves]

I have setup the following that appears within a tab named Scale.

  /**
  * @tokens Scale
  * @presenter Spacing
  */
  --density-modifier: 1;
  --font-default-scale: 1;
  --font-accent-scale: 1;

If I modify these values, the changes are correctly reflected in Storybook. If I select a different tab, make changes, and then re-select the Scale tab the values are reset back to their default settings.

Is there a way to preserve the values across the different tabs until the Design Tokens tab is closed? I was under the impression that this is what options: {preserveCSSVars: true} does but it doesn't seem to do the trick.