Does the auto-rehash of old algorithms occur for passwords with the parameter algorithm: auto?

Question

symfony

https://symfony.com/doc/current/security/password_...

But what about all the passwords for new versions of the framework where the security configs look like this

security:
  encoders:
    App\Domain\User\Entity\User:
      algorithm: auto
      cost: 31

Will the rehash be done automatically? After all, which one it chooses and how it hashes is determined under the hood, and to check whether it is necessary to do a rehash, you need to know the algorithm by which the password is hashed