I chose to create a word-based passphrase using the password generator. Upon deciding I did not like the words presented, I pressed the "refresh" button. The next generated password was not words as configured but characters.
Here is a screenshot of what I'm seeing:
1Password Version: 1.15.4
Extension Version: 1.15.4
OS Version: Chrome OS 73.0.3683.88
Sync Type: 1Password