Image links acting very strangely

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.

Infra:
Ubuntu Linux 18.04 (Bionic Beaver)
Ghost 3.36
Database server: MySQL 8.0.23
Web server nginx/1.14.0
Node.js 12.19.0
Certbot 0.31.0

[1] 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).

[2] Image code is modified to this format:

[![image_name](image_url)](my_link)

[3] Post is saved, published

[4] ‘View Page’ preview link shows a temporary page with correctly working hyperlinks

[5] 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.

[6] No joy from any of force-reload, new private window, ghost buster, nginx restart, ghost restart

[7] But my iPhone receives page with working hyperlinked images.

[8] Same results for a nearby friend: Mac Pro multiple browsers - no links. Samsung phone: has links.

[9] What?

[10] P.S. ‘edit hyperlink’ feature not available on image blocks, contrary to assertions in some other forum articles.

Please upgrade your version of Ghost. Linked images in markdown were buggy and could potentially become broken when saving between 3.0 and 4.2.1.

[10] P.S. ‘edit hyperlink’ feature not available on image blocks, contrary to assertions in some other forum articles.

This feature is only available from 4.0 onwards.

Acknowledge buggy Markdown, however we found aggravating factors …

Post slug is incremented to e.g. about-2 then about-3 without any warning, while the older about/ remains available. Revision of a slug (and hence URL) should not be silent!! Obsolete revisions should receive a watermark or badge indicating they are stale.

Differences between laptop and mobile are due to different navigation pathways, laptops used static nav link in wide-format nav bar, but this link is not available on phones so they navigate via recent post cards into the more recent URL/ recent revision of page. Obvious once the slug revisioning is detected.

Gaaah !