I’ve been the beautifier work perfectly in most places, however I’ve narrowed it down to this.
home {width: calc(var(--home_width) + 5px);}
it seems it doesn’t like var variable in conjuration with a calc.
apparently it considers this as invalid css, which is a problem for me, cause it doesn’t let me fix the formatting. I wouldn’t posted this to a GitHub or something, but I don’t know what beautifier you use or if it’s in house written.