Describe the bug
In my current project and in the example repo below the sourcemaps are offset by a few lines.
This seems to be related to the style tag:

To Reproduce

• clone repo (https://github.com/Maggi64/sapper-sourcemap-offset)
• npm run dev
• look at chrome dev tools

Expected behavior
Correctly linked sourcemaps. Otherwise debugging issues becomes quite hard.

Information about your project:

• Your browser and the version: (Chrome 87)

• Your operating system: (Windows 10)

• Rollup & svelte-preprocess are updated to the newest versions (see repo package.json)

• All other packages used are also on the newest version

I hope this is the correct place for this issue. Help and suggestions where that problem exactly comes from are appreciated.

Edit: Even without scss preprocessing this issue still persists. Adjusted example repo.