Chrome Version: 71.0.3578.94 (Official Build) (64-bit)
Chrome OS Version: 11151.59.0 (Official Build) stable-channel nocturne
Chrome OS Platform: Pixel Slate

Steps To Reproduce:
(1) Sign in to corp account
(2) Choose "Sign in another user" from Quick Settings in the Shelf
(3) Choose an account that has Pixel Imprint set up
(4) Touch the fingerprint sensor

Expected Result:
I am logged in without entering a password.

Actual Result:
Shelf hides itself