Missing font "BravuraText"

When I open a PDF I created in Dorico 3.5 in Affinity Publisher (or Designer) 1.92, I get a missing font warning:
Screenshot 2021-08-04 125945

When I exchange the “missing” font “BravuraText” (without space) with “Bravura Text”, everything is okay.
No big deal. Just want to mention it. Don’t know, if this is a Dorico, an Affinity or a SMuFL topic …

This is probably an Affinity issue, due to their slightly Byzantine conceptual handling of PDFs.