I'm seeing more sites using this style login (mostly financial or investment sites).
1Password doesn't seem to have any way to deal with this, but it would be a great feature if it could at least attempt to parse the text and autofill. Without this there's a danger it encourages people to use a simpler password, just so they can fill the characters from memory (yet they are typically the sites you need to be as secure as possible)
It's made even less usable by the fact the Reveal button is so fiddly (on OSX and Chrome extension), although Im sure it didn't used to be.
Maybe right-clicking the asterisked password could be used as a reveal shortcut?
1Password Version: 6.8.8
Extension Version: 18.104.22.168
OS Version: 10.12.6
Sync Type: Dropbox keychain