I have no idea what a JIRA is. Is that the support ticket system at vbulletin.com? Though as I mentioned, it's not a new issue with 4.2.2. I've had it ever since I installed 4.x a year ago.
I'll try to get the mods turned off briefly at some point when the site is quiet. But I'm not sure how an extra line is going to look different between code tags?
Code:
Surely it'll just look like this?
With an extra line.