Thank you for the comments. A few clarifications are necessary, I believe:
If you are referring to item 5 in the first list ("Ctrl-C, Ctrl-V"), it does not copy the text into a plain text location, it clipboards the fragment and then immediately pastes it over itself---in place. Thus, the text stays in the code block but its formatting is destroyed. The description above the list explicitly mentions "pasting text into code blocks".
When I'm selecting several lines in a code block then do Ctrl-C, Ctrl-V, all newlines are preserved just fine except the last one. So clearly, Evern