I have similar paste destinations as @Peter Green. (Mostly) plain text that is not processed in a design/publishing kind of way. It doesn't work for that. Other examples: Spelling and style checkers (like Grammarly and Duden).
The way that paragraph breaks are (not) pasted into other applications surprised me just a couple of hours ago. I didn't find a quick workaround yet (like inserting Shift+Return or lines with whitespace; those won't appear when I paste the text). Does anybody have an idea?