On all my clients (Windows 10, Mac OS X Mojave, iOS 12) 1Password is no more working correctly on https://banking.dkb.de.
The form fields are filled correctly, but if you try to login, an error states "The entered password must be at least five characters long".
It doesn't matter, if I use auto-fill by keyboard shortcut or select an entry of a list and choose it, to fill the form fields. Seems like the password is entered in the field, but not transmitted to the server upon sending the form.
It works, if you copy and paste the password manually into the field.
As mentioned, it's an all platforms the same:
Windows 10 Pro
1Password for Windows 7.2.581
Mac OS X Mojave
1Password Version: Not Provided
Extension Version: Not Provided
OS Version: Not Provided
Sync Type: Not Provided