When it had the dev-doc-needed keyword on it, this bug https://bugzilla.mozilla.org/show_bug.cgi?id=740477 wasn't listed in the tracker. Maybe because it is in Core/internationalization. Florian can you look at this when you have time? (The bug is now in the dev-doc-complete status)
The underlying bug list is http://bit.ly/HUJDe0 containing the product "Core". The components within aren't distinguished. See bug 623610 which is added to the fun for Gecko 12.0 :) I guess your bug was just not in the list for Gecko 14.0, but in the "triage inbox" where no version is set yet: http://beta.elchi3.de/doctracker/#list=fx&version=---
I looked in the inbox and didn't see it there. Hum.
I also looked in the inbox before. I often use the inbox as I sometimes document CSS bugs a few minutes after they are fixed. (Before we triage them in inbox). So I'm sure it wasn't there (I make a search on the page to be sure). I will keep an eye open to see if I see the problem again in the future.
Seems like this is not happening again. Reopen if you want more investigation here :)