Have experienced an issue in all public betas of iOS 11 where, on the lock screen, if I have any email notifications from a Gmail-based account, they will disappear from the lock screen when 1) any notification is interacted with, 2) thumb is rested on the TouchID sensor to unlock the phone, but not pressed to dismiss the lock screen. Seems to be isolated to Gmail accounts, any iCloud email notifications have remained on screen under the mentioned conditions.