&:after failed when using @extend

[ktmud]

%a {
  &:after {
      content: '\a';
  }
}
.a-kid {
  @extend %a;
}

Expected result:

.a-kid:after {
  content: '\a';
}

Got:

:after.a-kid {
  content: '\a';
}

[eevee]

Fixed by the pull.