When we have multiple domains configured for a Drupal website, this causes an error when the generated CSS file URL is absolute instead of relative. We need to force it to be relative.
Have to different domains one for back office and two for the front end, thew CSS path file will generate to the back office domain.
Add file_url_transform_relative() to simple_menu_icons_css_alter()
2.2
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Patch #4 works for me with version 2.3.
This solves my problem with CSS aggregation enabled.
In this case, Drupal tries to download CSS file from a public URL which timeout due to the network server configuration.
This causes very long page loads after cache clear.