Please look at this test case.
Usually, in a table division, first line is not wrapped, and following lines are wrapped inside <p> tags as in other contexts.
I would like to keep first line with second and third lines in the same paragraph. So I manually added a <p> tag to enclose the three lines.
It works well with Parsoid (2017 Wikitext Editor preview), but with MediaWiki parser, this make wrap each line inside its own <p> tag.
This is maybe T134469: doBlockLevels() inserts <p> and </p> randomly with no regard for HTML validity.