My credit card information was already saved and Google was just asking for my CVC Code to verify. (see attached screenshot)
I choose my credit card, but 1Password failed to enter the CVC Code.
Second issue is that 1Password Synapse failed to work once again:
I could see the form this time (yeah!), but when I pressed the Send Button, I got the error message.
Browser I'm using is Firefox Nightly 57.
1Password Version: 6.8.1
Extension Version: 220.127.116.11
OS Version: MacOS 10.13
Sync Type: Dropbox