1Password doesn't fill the user name (but only the password) on this page:
I'm using Firefox 67.0.
1Password Version: 7.2.6
Extension Version: 184.108.40.206
OS Version: macOS 10.14.4
Sync Type: Dropbox
Hey @manski! Could you please try saving a Login manually for this website?
I just tried this and I'm able to fill both the username and password. I'm looking forward to hearing whether this worked for you.