I edited a large page on meta (1.22wmf7) in VE. All seemed fine but review showed VE had removed the first character following several closing </pre> tags. It also removed a few characters within a <source> tag.

Here's the diff showing the removal, it's self-explanatory. https://www.mediawiki.org/w/index.php?title=Extension%3AEventLogging%2FGuide&diff=716359&oldid=704840. I will restore the characters by hand.
I'm using Firefox 21.0 on Kubuntu 13.04.

I tried editing the same document again and this time VE removed more characters from the source tag, added a space after a <pre>. Hmm. I'm setting to critical as it's recoverable data loss, but maybe it's intermittent.

Version: unspecified
Severity: critical