Cannot reproduce Warned threads stay in moderation queue

I'm not sure what version we're running, it won't be the latest but this little gotcha has been hanging around for a while...

If you have a post in the moderation queue that is the first post in a thread and you give that post a warning and opt to delete it the post/thread is deleted, the warning is given but the post remains in the moderation queue. It then has to be redeleted.