I'm noticing a strange issue though I don't know if it's specific to 1Password or iOS 12.0.
Basically when auto-filling password fields in 3rd-party apps by tapping the 1Password auto-fill suggestion on the in-app keyboard, the username appears to be filled in but the password field remains blank. Only after tapping into the password field do the password dots appear.
I've noticed this in multiple 3rd party apps. It doesn't happen in Mobile Safari.
1Password Version: 7.2
Extension Version: Not Provided
OS Version: iOS 12.0
Sync Type: Family Accounts