DisplayName is null onAuthStateChanged when creating a user using SignUpAuthScreen

[Fundi1330]

[REQUIRED] Describe your environment

• Operating System version: Ubuntu 22.04.5 LTS
• Browser version: Chrome 146.0.7680.164
• Firebase UI version: 7.0.2-beta
• Firebase SDK version: 12.10.0
• Package name: @firebase-oss/ui-react

[REQUIRED] Describe the problem

Steps to reproduce

I am using <SignUpAuthScreen/> component with email and password auth enabled. I am using onAuthStateChanged to set the user in my redux store. However, because the displayName is set using updateProfile method, which is called after createUserWithEmailAndPassword, the displayName is null when I set the user object. And there is no way to pass a callback to updateProfile currently. Nor there is a function similar to onAuthStateChanged but for updateProfile.
The issue does not occur with OAuth. Also, the displayName appears when I refresh the page

Relevant Code

https://stackblitz.com/fork/firebase-issue-sandbox

const SignUp = () => {
    const navigate = useNavigate();

    const handleSignUp = () => {
        navigate('/');
    };
    return <>
        <SignUpAuthScreen onSignUp={handleSignUp}>
            <GoogleSignInButton onSignIn={handleSignUp} provider={google} />
            <Link to={'/auth/sign-in'}>Вже маєте аккаунт? Увійдіть у нього!</Link>
        </SignUpAuthScreen>
    </>;
}

const ui = initializeUI({
    app,
    behaviors: [
        requireDisplayName(),
        providerPopupStrategy(),
    ],
});

onAuthStateChanged(auth, async (user) => {
    if (user) {
        const userData = {
            uid: user.uid,
            email: user.email,
            displayName: user.displayName,
            photoURL: user.photoURL,
            emailVerified: user.emailVerified,
            isAnonymous: user.isAnonymous,
            idToken: await user.getIdToken()
        };
        store.dispatch(setUser(userData));
        console.log('User authenticated!');
    } else {
        store.dispatch(setUser(null));
        console.log('Sign out!')
    }
});

[russellwheatley]

Hey @Fundi1330 - thank you for filing this issue, on first pass, this seems like a valid issue. I'll get back to you when I've had a chance to properly investigate 🙏