Hi @underhat, +1 added for the keyboard.
I suspect loading the Autofill data is exceeding the 5 second limit set by the system causing it not to appear. If that's the case, reloading the app or webpage in a number of ways (including opening you keyboard settings) might give 1Password the second chance it needs to load the relevant data.
The team here is working on some changes to help improve this behavior. Do you see similar results if you slowly tap between the username and password field, minimize then re-open Chrome or refresh the page?