Autoprefixer setup for next.js not adding expected vendor prefixes for text-size-adjust

What version of Next.js are you using?

10.1.2

What version of Node.js are you using?

14.16.0

What browser are you using?

Safari

What operating system are you using?

macOS

How are you deploying your application?

Vercel

Describe the Bug

Next.js' autoprefixer is not prefixing the text-size-adjust rule with webkit and ms, even though the browsers I support through my browserslist query mean those prefixes should be present.

Expected Behavior

So I verified with https://autoprefixer.github.io. Using "browserslist": ["defaults"],, same as in my package.json. This:

.example {
    text-size-adjust: 100%;
}

gets autoprefixed to:

/*
* Prefixed by https://autoprefixer.github.io
* PostCSS: v7.0.29,
* Autoprefixer: v9.7.6
* Browsers: defaults
*/

.example {
    -webkit-text-size-adjust: 100%;
       -moz-text-size-adjust: 100%;
        -ms-text-size-adjust: 100%;
            text-size-adjust: 100%;
}

Which is correct (the safari versions currently part of the "defaults" query expect a prefix). However, next.js produces:

.example {
       -moz-text-size-adjust: 100%;
            text-size-adjust: 100%;
}

Which is incorrect. The -webkit and -ms prefixes are missing.

To Reproduce

To reproduce, add "browserslist": ["defaults"], to your package.json. Create a css module with the following rule:

.container {
  text-size-adjust: 100%;
}

And use it in a component in your app. Next.js will compile that to:

[css-module-class] {
    -moz-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

Screenshot of the correctly autoprefixed css:

Screenshot of the css next.js generates:

[Flydiverny]

Same / related: #23551

[jankaifer]

This was probably fixed with #23551
Post here your reproduction if you still experience this issue and we will reopen.

[github-actions]

This closed issue has been automatically locked because it had no new activity for a month. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.