An image inserted in a post via either Markdown or HTML, with a wrapped link tag, is rendered as a static image (i.e. not hyperlinked) in some circumstances.
Ubuntu Linux 18.04 (Bionic Beaver)
Database server: MySQL 8.0.23
Web server nginx/1.14.0
 Image may be loaded by dragging onto a Markdown edit block, or by loading to a static asset path (nginx serves /file/* directly, but ghost via proxy socket).
 Image code is modified to this format:
 Post is saved, published
 ‘View Page’ preview link shows a temporary page with correctly working hyperlinks
 If published page is loaded at permanent URL, images are static with no hyperlinks. No hyperinks visible in HTML source. Mac Pro with Safari, Chrome, Firefox all the same.
 No joy from any of force-reload, new private window, ghost buster, nginx restart, ghost restart
 But my iPhone receives page with working hyperlinked images.
 Same results for a nearby friend: Mac Pro multiple browsers - no links. Samsung phone: has links.
 P.S. ‘edit hyperlink’ feature not available on image blocks, contrary to assertions in some other forum articles.