Using the simplified sign-in with tvOS and a third party password manager, I receive a complete ASPasswordCredential, and I can easily log into my app. When I do the same thing but with Apple's password manager as the source, I receive an ASPasswordCredential that includes the email address, but the password is an empty string.
I have tried deleting the credentials from Apple Passwords and regenerating them with a new login to the app's website. I have tried restarting my iPhone.
Is this the expected behavior? How should I be getting a password from Apple's Password app with an ASAuthorizationPasswordRequest?