Fairly frequently, but not 100% of the time, when 1password is the running app and I unlock the phone from standby, the master password input field is unresponsive. I can press keys on the Android keyboard but those presses are not reflected in the password field. I've not observed this in any other application.
I can email diagnostic info from the app or gather a bug report from the Android OS if requested.
1Password Version: 6.4.3
Extension Version: 188.8.131.52
OS Version: Android 7.1
Sync Type: Dropbox