How do I make the bread crumb work properly in the Indigo skin for HTML5 on unstructured FM2020?

I am working on a new template, and want to use the Indigo skin for HTML5 with unstructured FrameMaker 2020. But I can't make the breadcrumb pick up the correct topics names. It stays put at Chapter 1 even if I assign each Chapter Name paragraph as a topic when publishing.
Is there a way to fix it?

