Hi,
Thank you for the details!
The issue is related to an SG optimizer bug, where it picks up some CSS files, but then it does not add it back in during the combine method. We already addressed that in the next release with a hacky workaround. I hope they will fix that soon, I see a lot of bypasses in other plugin codes as well just to get around this SG optimizer issue.
Until then, you can resolve it by changing this option: https://i.imgur.com/46DQfwq.png.
