Oh that's interesting.. Quoting it inside a quote fixes it lol?
Amæ
Life as we know it could be gone in a minute
That's actually because the \ in \n doesn't get escaped when it actually should, so when it gets quoted, it converts to a newline and further quotes will remain as newlines.
When they fix it or if you use the latest version of linkify, it will correctly quote as "\n\n\n", (originally something else lol)
The problem is that \ is not escaped as \\ when the page is loaded as part of a string in a function that generates the quote from the post.
It's very unlikely they would change all the posts in the forums to remove backslash where it acts as an escape character, so the only other way an old post would have it missing is that it was missing at the time the quote function was loaded.