See this one. Found this from the community highlights newsletter. No, no other session, so the user session skin is taken. That’s the problem.
And here I thought, that there is a complete defined default theme, which is then not merged with other ones and selectable.
O.k. When it is whyever not available and there is no explanation for this, I have to deal with it as I did here
I only came again on this, because of the news about the dark skin in this release.