I discovered one site in my list was known to have been compromised. I went over to Vulnerable Passwords, enabled the feature and there it was, my password was compromised as expected. Went to the site, changed both my username (for reasons) and password (for security). Saved the new info into 1Password.
The item still appears in the Vulnerable Passwords list. On a lark I checked against @haveibeenpwned directly and my new password was not in the list.
It seems that this is a bit misleading, the item should immediately be removed from this view when the item's password is changed, or better, check the password and popup a big fat "Your new password is also compromised" modal warning if listed or remove it if not listed.
It also isn't obvious to me how I would recheck an item, or otherwise refresh the Vulnerable Passwords list so that I can move through this list like a todo list.
1Password Version: 7.1.566
Extension Version: Not Provided
OS Version: Not Provided
Sync Type: 1Password.com