clean-css removes wildcard selector

I’m using clean-css v3.0.7, and it seems like clean-css removes the wildcard selectors.

Before:

*,
*:before,
*:after {
    box-sizing: border-box;
}

After:

:before,:after{box-sizing:border-box}

Expected:

*,*:before,*:after{box-sizing:border-box}

I’ve tested all kinds of different arguments, but nothing seems to fix this. Any ideas?

[epogeedesign]

As a note we found disabling this particular rule solved the issue:

new CleanCSS({
  level: {
    1: {
      tidySelectors: false // turns off optimizing selectors
    }
  }
});

[jakubpawlowicz]

Thanks @epogeedesign for the comment, it’s helpful for those who may stumble upon this behavior of clean-css.