mixin and apply in the official document is not working

[alijvhr]

The transform example code in official documentation is not working!

CSS source code

@mixin username {
    display: flex;
    gap: 5px;
    position: relative;
    text-align: start;
    align-items: center;

    .uname {

    }

    .uid {
        display: flex;
        font-size: .7em;
        align-items: center;
        opacity: .6;
        position: absolute;
        top: -.7em;
    }
}

#live-users {
    padding: 0;
    position: absolute;

    .user {
        @apply username;
        box-shadow: 0 0 100px #00000020 inset;
        border-radius: var(--radius-default);
        padding: 4px 10px;
    }
}

version 1.30.1

It causes the nested declarations to output at root level without parent! the following output is example:

#live-users .user {
  text-align: start;
  align-items: center;
  gap: 5px;
  display: flex;
  position: relative;
}

.uid {
  opacity: .6;
  align-items: center;
  font-size: .7em;
  display: flex;
  position: absolute;
  top: -.7em;
}

#live-users .user {
  border-radius: var(--radius-default);
  padding: 4px 10px;
  box-shadow: inset 0 0 100px #00000020;
}

version 1.30.2

It causes error following error:

2025-10-10T13:17:47.296929372Z [vite:css] [lightningcss] failed to deserialize; expected an object-like struct named Specifier, found ()

Expected output

I expect to get the following output:

#live-users .user {
    text-align: start;
    align-items: center;
    gap: 5px; 
    display: flex; 
    position: relative;
    border-radius: var(--radius-default);
    padding: 4px 10px;
    box-shadow: inset 0 0 100px #00000020;
}

#live-users .user .uid {
    opacity: .6;
    align-items: center;
    font-size: .7em;
    display: flex;
    position: absolute;
    top: -.7em;
}

[mattpilott]

https://github.com/parcel-bundler/lightningcss/issues/1065