If you right click on a section heading in a Passage Guide, you get a context menu which includes a Copy command.

That copy command doesn't work for at least two sections: Outline and Cultural Concepts. It merely copies an underscore character to the clipboard in those cases. These two were the first two sections I tried, so at first I assumed it was universal. But it does work for some of the other sections (Literary Typing, Parallel Passages, Cross References). I didn't have time to test every single section, but whoever works on fixing this bug should do so before announcing that it's completely fixed.