URL alias was not deleted after a node was deleted

Multilingual site (English & French; default is English)

First create a page, set its URL path as indexE.html (internal path node/3)
Then clicking the "Translate" tab to enter French translation of the page content, set its URL path as indexF.html (internal path node/4)

Visit indexE.html, and delete this node. In DB's url_alias table, the record associates node/3 with indexE.html was deleted
Visit indexF.html, and delete this node. In DB's url_alias table, the record associates node/4 with indexF.html was not deleted

Is this a bug?

Thanks,