• VS Code Version: 1.90.0
• SCSS IntelliSense Version: v0.10.0
• Operating System: Mac OS 14.5 (23F79)

SCSS is not supported within .astro files.

Reproducible Case:

Create a simple red-text.astro file:

<p>This should be red</p>

<style lang="scss">
   @mixin red-text {
      color: red;
   }

   p {
      @include red-text;
   }
</style>

red-text.astro.zip

There's no intellisense support whatsoever within the scss style block.

Note: As svelte and astro are very similar in their style blocks, it probably would suffice to activate astro as svelte.