Yes, 1Password is especially bad at not saving generated passwords to the specific account you are trying to update. However, by changing your settings, you can

Yes, 1Password is especially bad at not saving generated passwords to the specific account you are trying to update. However, by changing your settings, you can get a history of all generated passwords, sorted by website. It's a pain, but you can grab that password from the history, and update the login record for the website in question.