When reviewing the list of tags on Arqade, I noticed a strange tag named 100-completion.
Clicking on the tag reveals that there are 0 questions which use this tag. Trying to view the tag info page leads to a "Page Not Found" error, and the tag does not appear in the tag auto-complete suggestions when asking a new question.
Why does this tag with 0 questions show up in the tag search? Shouldn't it have been auto-deleted?