I just added a post notice to a question and saw the font had dropped down a size:
I haven't added a post notice in several days so I don't know when it started doing this, but could it be related to the change in code block font size?
While full Markdown wraps (almost) everything in
<p> tags, MarkdownMini does not (since there aren't really paragraphs in comments).
The style rules in the CSS however expect the text to be in
<p> tags. In the next built, that expectation will be met again.