I recently added a paragraph to our app’s description in its .metainfo.xml
file. The app’s About page has since been updated, but the new paragraph appears simply as “(null)”.
Is this perhaps because the paragraph contains an unordered list tag, list items or <em>
tags? The XML file passes the org.freedesktop.appstream-glib validate
test, and the description respects documented AppStream limitations, but maybe there are additional limitations imposed by Flathub? What else might cause a paragraph to be replaced by “(null)”?