@import "ignore.css" (min-width: 25em);

/* ignore.css */
@import "http://css-screen" screen;

Becomes :

@import "http://css-screen" (min-width: 25em) and screen;

Should be :

@import "http://css-screen" screen and (min-width: 25em);

It might be interesting to adopt our media query parser : https://github.com/csstools/postcss-plugins/tree/postcss-preset-env--v8/packages/media-query-list-parser#readme

It has a typed object model which makes it easier to avoid these issues.

Alternatively it is possible to "special case" these keywords :

• screen
• print
• all
• not

And then sorting the media query lists :

1. these keywords first
2. everything else later
3. join with and