Many sites, a prime example being this one, have a pop-up to log in. Lastpass does not or maybe cannot recognize that the pop-up belongs to the url for the stored login info, even though the last past icon is in the password field. My understanding is that one then has to open the vault to search for the to password entry and copy the password.
It would be very useful if lastpass would allow a search of the vault to access the password when one clicks on the icon in the password field. The user id for a login is a problem only if it is other than one's email.