I think the list and lists should be merged: they both share the same tag wiki and I can't imagine that these are needed separately.
updating post history, 167 rows affected
updating posts, 120 rows affected
updating PostTags associations, 120 rows affected
removing/renaming old tag, 0 rows affected
updating count for master tag, 1 rows affected tag remapping of [lists] and [list] complete!
remapping 0 synonyms
3 favorite and ignored tags remapped!
Broadcasting tag-engine reload
I went with the Plural lists to be the master rather than the singular version.