Maybe this is intentional, but it draws the eye away from the content, leaving me thinking, “what is up with that image/avatar?”, instead of “oh cool, syntax highlighting!”
I think also beta 8 and 9 I saw this.
Current workaround/solution is to just add the following css either to the Theme directly or as a Theme Component
div.published-page-author img.avatar{ border:0px solid var(--tertiary-medium); }