Running npm run start doesn't update styles

When I try to update the styles for my theme I do not see the changes update.

# inside my theme folder
npm run start

I can see the site fine and it initializes with the correct styles.

Then I make a changes to main.scss

// inside main.scss
// ...

// make everything pink
* {
 color: pink;

The problem is that the styles dont update. I see them in the original color instead of pink. If I stop the service and run npm run start again I will see pink.

What version of Sage are you running?