Oh, that explains a lot. The HTML doesn’t display in Annie footnote popups, but AFAIK Tippy itself is working fine. (I didn’t see anything amiss when I tried Tippy with Annie deactivated) For some reason I thought I was able to do text formatting and line breaks in earlier versions of Annie popups, but I’m obviously mis-remembering that. I must be remembering the formatting in the Annie footnotes at the bottom of the entry.
So, please regard this as a feature request rather than a support issue, and thank you for your time!