本文详细解释了Symfony框架中因用户信息不匹配导致的Cookie删除问题，并提供了具体的解决方案。问题出现在UserProvider类中的supportsClass方法返回了错误的字符串，正确的做法应该是返回'AppBundleEntityUser'。
I recently had this problem, and here is the solution I found:
The reason why the cookie is deleted is because the user information that the cookie contains doesn't match anything that Symfony knows about. It can't log a user in based on the cookie, so it just deletes it. The issue in my case was an incorrect string in my UserProvider class. The specific method is supportsClass. It was returning 'AppBundle\Security\User' when it should have actually been returning `'AppBundle\Entity\User'. This caused Symfony to be unable to find any users based on the information in the cookie, and then it would just delete the cookie and move on.
You can do some more troubleshooting if you go into this file: vendor/symfony/symfony/src/Symfony/Component/Security/Http/RememberMe/TokenBasedRememberMeServices.php. Play around in processAutoLoginCookie and see if you can't figure something out!
Good luck!
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