lenau on "[Plugin: Autoptimize] CSS and JS files are ignored during minification"

I've now tested more. One thing I noticed is that AO seems to change the relative urls in CSS files e.g.

@font-face {
    font-family: 'Mono Social Icons Font';
    src: url('fonts/MonoSocialIconsFont-1.10.eot');

to absolute urls. And here it's expended to urls starting with "http" instead of "https" resulting in many warnings for insecure content.

I don't really understand how AO and HTTPS plugins work together and where this could be fixed. As last resort I can always hard-code absolute URLs in my stylesheets but I'd rather not.