On the global site at /en/sandbox/safe-ai-for-children/ there are a poll, survey, quiz and article.

Each has an icon added, but none of the icons are showing.

My recollection is that we enabled icons for surveys polls and quizzes when they are listed in a Section Page. I'm not sure whether we enabled icons for articles, but I think we can enable that.

Possibly this issue came up during a Wagtail upgrade?