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ok, I did some more research, turns out that callback notification goes to the if we press "cancel" button but goes wrong when authentication succeeds

as you can see in the attached project
if you open the bio-prompt in the 1st Fragment and authenticate
and after that you go to the 2nd Fragment and authenticate in the bio-prompt
callback notifies the Fragment1 instead of the Fragment2 as you can see in the logs

expected result is that Fragment2 is notified instead of Fragment1

also if you first go to Fragment2 and after that you go to Fragment1 always opening the prompt and doing the authentication
Fragment2 is notified instead of Fragment1

funny thing is that doing cancel instead of authentication notification works ok

https://drive.google.com/open?id=1ZVhp9sFBJ6pa1bKzHg1AM5tF5XnmyFMM

manually closing the FingerprintHelperFragment works as a workaround
```
   override fun onPause() {
        // WORKAROUND for https://issuetracker.google.com/issues/123857949
        activity?.let { activity ->
            activity.supportFragmentManager.findFragmentByTag("FingerprintHelperFragment")?.let {
                activity.supportFragmentManager.beginTransaction().remove(it).commitAllowingStateLoss()
            }
            super.onPause()
        }
    }
```

Issue is reproducible. More details are here - https://drive.google.com/corp/drive/folders/1jaiApoKzTxQc-Rg46D8qmP9MpKhkBo2D  (internal only link).