Hi,
Quite a few traditional Chinese example sentences use 瞭 where 了 should be used.
For example: 我的筆丟瞭。
http://www.skritter.com/vocab/wordpopup?vocabKey=zh-%E6%88%91%E7%9A%84%E7%AC%94%E4%B8%A2%E4%BA%86-2&_caution=true&timeStamp=1379666216047
k
PS: oops, forgot the forum isn't where bug reports should be made, sorry!