This is still an issue. Attached a couple videos on how it works in Firefox vs Orion. I'm not sure, but I think the Firefox browser's extension integrates with the natively installed 1Password app (I have the same Firefox extension installed in Orion) . I don't know how else it would be able to do this -- I don't know if FF extensions have the capability to store biometrics.
Edit: perhaps I'm missing a step based on @clay's response?