I had some of the vault's login Tag filled in with names like "junk" or "financial". When I download a CSV backup copy, these names are included. I decided to change the tag value to the email address associated with its login. The former names still download, but when I update a tag to something like "me@somewhere.com", the downloaded tag value is blank. Testing the idea that my new tags were too long, I discovered that even a 2-letter tag downloaded blank. Tags must have been phased out in an update...