Filter via Tags broken

[Kenshino]

See

There are dozens of tickets tagged with sponsor but the filtering fails to work.

However, if I simply the query to - https://2016.singapore.wordcamp.org/wp-admin/edit.php?sf_tags=sponsor&post_type=sf_ticket , it works

https://2016.singapore.wordcamp.org/wp-admin/edit.php?s&post_status=all&post_type=sf_ticket&action=-1&m=0&author=0&sf_tags=sponsor&email_account&filter_action=Filter&paged=1&action2=-1 does not work.

Removing the &author=0 seems to make it work. However it only gets the OPEN tickets.