Paragraphs are separated by an empty line in Markdown. See Markdown Cheatsheet · adam-p/markdown-here Wiki · GitHub under Line Breaks.
I don’t know how Bear and Ulysses handle them. I tried in Bear, and without an extra empty line, there is no paragraph delineation (eg extra space), so I assume it also requires an empty line for a paragraph. It is a markdown editor, so I assume it must.
If I have misunderstood, please post a screenshot to demonstrate.
Kind regards,
Drew