I am using 1Password for iOS beta 7.2.7 (70207001) and have just found out this function does not work as intended.
When I click on a password and select "Reveal", ●●●●●becomes ***** even in "Show in large type".
1Password Version: 1Password for iOS beta 7.2.7 (70207001)
Extension Version: Not Provided
OS Version: iOS 12.1.2
Sync Type: Subscription