Removing tags from all documents does not remove it from the respository

Continuing the discussion from [Solved] Remove some result from tag:

Someone from Prismic said "Quick update for older repositories, removing a tag from all documents should now remove it completely from the repository."

This is not the case. We have at least one tag that is appearing in tag filter list (on the main /documents/working view) and also as an auto-complete option (when editing tags on documents) that is not currently being used on any working or archived document.

A post was merged into an existing topic: [Solved] Remove some result from tag