It's the spawn of an unholy union between Markdown and WYSIWYG. Triple backticks is the opening (and closing) sequence of characters used to denote multiline snippets of 'preformatted text' or code in Markdown.

Pressing enter 5 times is what happens because Microsoft insists on preventing you from writing actual Markdown, even as an option.

Single backticks works (and you can use a second backtick to close 'exit' that formatting mode), but delightfully, it only works if you're typing, and not if you copy and paste.

In the editor it inserted half a page of blank lines for no reason.

Then it sent the snippet with an ENORMOUS bold heading, also for no reason.

Then the 4-line script was truncated to 3 lines so as to confuse the person receiving it.

Fantastic quality.