Turbopack fails on CSS pseudo-class 'focus-visible-within'

[kongebra]

When running my Next.js project with --turbopack, the build fails due to a CSS parsing error. The same project builds and runs fine using the default webpack dev server.

Error shown:

'focus-visible-within' is not recognized as a valid pseudo-class. Did you mean '::focus-visible-within' (pseudo-element) or is this a typo?

This happens when parsing the following CSS from a dependency:

.md-autocomplete__input:focus-visible, 
.md-autocomplete__input:focus-visible-within {
  outline: none;
}

Notes:

• Using Next.js 15.5.3
• Only occurs with Turbopack, not Webpack
• Import trace points to CSS inside @miljodirektoratet/md-css in the Autocomplete component

Printscreen:

[ohp-inmeta]

MdAutocomplete is deprecated, so if it's causing issues, now is the time to remove it completely! MdComboBox should be used in stead.

[kongebra]

MdAutocomplete is deprecated, so if it's causing issues, now is the time to remove it completely! MdComboBox should be used in stead.

Okei, it is not used, just the error I get from importing the NPM-package, while using turbopack with Next.js