(I'm not sure I'm right on this meta site, but since there's a bug
tag...)
The following is a link to a web page with a trailing )
in its URL:
I know, the parentheses can be escaped, but that's not the issue here.
It's markdown live preview looks like this (apart from the actual URL):
test)
I.e. the trailing )
of the URL is thought of as the close parenthesis of the markdown code.
Now, if everything goes as I remember, the finished post will have a link that looks like this:
Therefore, the server-side markdown parser behavior is different from the JS live preview.