In this snippet,
<table><tr><td> [[File:Cambodia-map-blank.PNG|162px]]<div>Cambodia</div></td></tr></table>
the PHP parser + Tidy combo doesn't wrap the image in a p-tag. Parsoid wraps it in a p-tag. This then introduces a small whitespace rendering diff in the infobox -- this might be the source of several of the visual diffs seen in infoboxes where there is a leading image.
This could potentially also go away when Tidy goes away. Might not be worth fixing right yet.
A simpler test case is,
<table><tr><td> a</td></tr></table>
This is similar to the tests around "Paragraphs inside blockquotes/divs (no extra line breaks)"
where the comment will say,
## This is a corner case interaction between the paragraph wrapping in the ## php parser's BlockLevelPass and Remex. `doBlockLevels` has a notion of ## some tags which close paragraphs (and thus prevent wrapping on their line), ## of which "div" is one, but do p-wrapping inside them. These are referred ## to as "never suppressing". Remex, for its part, doesn't traverse into ## "div"s to p-wrap. Hence, we only get this partial wrapping.