next-rspack unclear css errors

### Link to the code that reproduces this issue https://github.com/Git-I985/next-rspack-unclear-css-errors ### To Reproduce # next-rspack unclear or not displayed css errors Sandbox https://codesandbox.io/p/github/Git-I985/next-rspack-unclear-css-errors/main Deps and versions in `package.json` ## Issue - `example.scss` contains error - exec `npm run build` - next start building project - u see ``` ➜ workspace git:(main) ✗ npm run build > nextjs@0.1.0 build /project/workspace > next build ▲ Next.js 15.3.1 (Rspack) Creating an optimized production build ... ⚠ `next-rspack` is currently experimental. It's not an official Next.js plugin, and is supported by the Rspack team in partnership with Next.js. Help improve Next.js and Rspack by providing feedback at https://github.com/vercel/next.js/discussions/77800 ⚠ `next-rspack` is currently experimental. It's not an official Next.js plugin, and is supported by the Rspack team in partnership with Next.js. Help improve Next.js and Rspack by providing feedback at https://github.com/vercel/next.js/discussions/77800 ⚠ `next-rspack` is currently experimental. It's not an official Next.js plugin, and is supported by the Rspack team in partnership with Next.js. Help improve Next.js and Rspack by providing feedback at https://github.com/vercel/next.js/discussions/77800 ⚠ Compiled with warnings in 1000ms ⚠ Unexpected token Function("var") at static/css/2cefff9d3ed3ad50.css:0:42 ✓ Compiled successfully in 2000ms ✓ Linting and checking validity of types ✓ Collecting page data ✓ Generating static pages (5/5) ... then i press Ctrl + C ``` - **You don’t understand where the error is or in which file. You only have a hashed file name, and this file doesn’t appear in the `.next` folder.<br/>At the same time, you don’t know its original name in the `src` folder, so you just don’t understand where the error is located at all. Its hard to work this way when u have 1000+ scss files** - in dev mode `npm run dev` u will not see …