Problem with @content includes

[o-faro]

This is a really great Module!

But I found a problem with includes:

%placeholder {
  @include breakpoint(xs) {
    width: $value1;
  }
  width: $value2;
  flex-shrink: 0;
}  

outputs this:

%placeholder {
  @include breakpoint(xs) {
  flex-shrink: 0;
  width: $value2;
    width: $value1;
  }
}

Which is very strange. I use includes with @content a lot and it works fine except in this case. I can't figure out why it happens here. Any ideas whats going wrong?