Obscenity filter turns off the blacklist filter?

I think I found a blacklisting bug.

On a test blog, I enabled the profanity filter, with the workd "f u c k". I then added the word "s h i t" to the blacklist filter. (Both with the spaces removed, of course...)

I then logged out, and posted a comment with the word "s h i t" in it. The blacklisting filter didn't allow it to be recorded. (Good.)

I then posted a comment with "f u c k" in it. The obscenity filter caused the comment to be posted, with "****" instead. (Good.)

I then posted a comment again with the word "s h i t". The blacklisting filter DIDN'T work! The comment was posted onto the blog. (Bad)

I think something in a triggered obscenity filter disables the blacklisting filter. Can you look at this?

John