newUser page is always called even if user is not new on Google or Facebook Login

[seaver-choy]

Environment

OS: 14.4.1
Node: 21.7.3
"next": "14.0.3",
"next-auth": "^4.24.5",
"@next-auth/mongodb-adapter": "^1.1.3",

Reproduction URL

https://callback-next-git-new-login-and-signup-callbacks-projects.vercel.app

Describe the issue

1. Declared a page for new-user with Google OR Facebook Login with expectation that it only gets called when sign up.

    signIn: '/register',
    verifyRequest: '/auth/verify-request',
    newUser: '/auth/new-user',
  },```
 2. Subsequent sign in calls STILL go to newUser page when using Google or Facebook Login

### How to reproduce

1. Use Sign In on OAuth Providers ✅
2. Redirect to newUser Page ✅
3. Logout ✅
4. Resign In with OAuth Providers, newUser page is still redirected to. ❌

### Expected behavior

1. Use Sign in on OAuth Providers 
2. Redirect to newUser page
3. Logout 
4. Resign In with OAuth Providers, newUser page is NOT redirected to. 

[github-actions]

We could not detect a valid reproduction link. Make sure to follow the bug report template carefully.

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Useful Resources

• How to create a Minimal, Complete, and Verifiable example
• Bug report: Framework
• Bug report: Provider
• Bug report: Adapter