I've come across this feature request in the featured tab. It already has the maximum 5 tags, so there is no room for a status tag. It seems that it either must stay as it is with no status tags, or one of the tags must be removed to allow room for a status tag. This seems a little bit pointless, since all it's tags relate to the question.
To solve this, the limit of 5 tags could be removed for moderator-only tags in order to be able to place status tags on questions that already have 5 tags.