In iOS, when a login field is detected with a saved LastPass login, LastPass shows an option to log in at the bottom (see screenshot). However, when tapping the blue button to use a saved username before user is logged into LastPass, nothing happens. The user must press the small grey key icon at the bottom-right in order to log in to LastPass. This loses time and is not intuitive. This appears to be a bug. Expected behavior: Tapping the large blue button should prompt the user to login (if user not already logged in).
This is with LastPass set as the default iOS password manager.