The earlier fix covered the Markdown body and stopped there, so the preview
still ran lines together — which is exactly what it looked like from the
outside: nothing had changed.
Summary, problem, conclusion, environment and the rest are plain text. They
never pass through the Markdown parser, so their newlines sit in a text node
and HTML collapses them, and the renderer that now emits <br> for the body was
never asked about them.
They render through the same rule now. One helper, one behaviour: a line the
author broke stays broken, wherever they typed it.
Text written across several lines rendered as one run-on line. Markdown reads a
single newline as a space that joins a paragraph, the parser leaves that
newline inside the text node, and HTML then collapses it — so the break the
author pressed Enter for disappeared at the last step.
This was never a preview artifact: the Studio preview and the public page go
through the same renderer, so a published record ran its lines together too.
Newlines inside a paragraph now render as <br>. Paragraphs separated by a blank
line are already two paragraphs by the time they reach here, so this only
affects the breaks an author put inside one.
DongHyeonka