Steps to reproduce
Post > New Work
Fill out the form with required information, and be sure to use at least one brand new tag of any type
Log in as admin
Access the work you just posted
Log in as a tag wrangler
Search > Tags
Search for the brand new you used on the work
The count beside the tag in the search results is (1). If you follow the link to the tag landing page, and then follow the Edit link, you'll find the Taggings Count displayed in the sidebar is also (1).
What should happen
Works hidden by admin should not be included in the taggings count, as it is a common source of confusion for tag wranglers, particularly in the case of single-use tags on works hidden by admin.