I noticed that if someone posts a thread in another language that is just under the min characters for thread title, and the langtitle tags go over this limit, this screws up the display of the thread in forumdisplay, search results, and on the thread page itself. The same goes if a thread title is translated, someone replies to the thread, and 'Re:' sends the post title over its character limit.
I can't show an example of this because I had to fix it on my forum. I'm sure if can be replicated here if you enter a title just under the thread title character limit that is translated from the default language.