A lot of issues automatically marked as spam (BB-4547)

Since few days ago all issues on https://bitbucket.org/kazandaemon/ncx_server/issues?status=new&status=open automatically marks as spam. This is private issue tracker, so there is no reason for spam filter on it.

When issue or a comment on it is marked as spam, no notification sent to followers or admins of issue tracker. Notification were not sent even if comment marked as "not spam".

How to disable spam filter on private issue trackers? Why did it enabled on it?