Not removing unnecessary `:is()` in selector `.main > :is(.wrapper > *, .wrapper2 > *)`

[n0099]

Bug description

As title.

Source CSS

.main > :is(.wrapper > *, .wrapper2 > *) {
    font-size: 2rem;
}

Expected CSS

.main > .wrapper > * {
    font-size: 2rem;
}
.main > .wrapper2 > * {
    font-size: 2rem;
}

Actual CSS

.main > :is(.wrapper > *) {
    font-size: 2rem;
}
.main > :is(.wrapper2 > *) {
    font-size: 2rem;
}

Playgound example

https://preset-env.cssdb.org/playground/#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

Does it happen with npx @csstools/csstools-cli <plugin-name> minimal-example.css?

Yes

Debug output

postcss-is-pseudo-class: test.css:1:1: Complex selectors in '.main > :is(.wrapper > *, .wrapper2 > *)' can not be transformed to an equivalent selector without ':is()'.
postcss-is-pseudo-class: test.css:1:1: Complex selectors in '.main > :is(.wrapper > *)' can not be transformed to an equivalent selector without ':is()'.
postcss-is-pseudo-class: test.css:1:1: Complex selectors in '.main > :is(.wrapper2 > *)' can not be transformed to an equivalent selector without ':is()'.

Extra config

postcss-preset-env

{
  minimumVendorImplementations: 2
}

browserslist

defaults
> 0.1% in CN
fully supports es6-module and fully supports url

What plugin are you experiencing this issue on?

PostCSS Preset Env

Plugin version

10.2.1

What OS are you experiencing this on?

Linux, Windows

Node Version

24.1.0

Validations

• Follow our Code of Conduct
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

Would you like to open a PR for this bug?

• I'm willing to open a PR

[romainmenke]

Hi @n0099,
Thank you for opening an issue about this.

.main > .wrapper > * would be incorrect.

The output could be: .main.wrapper > *

See: https://codepen.io/romainmenke/pen/YPXxmKK