[2.0.0-beta1] Drupal 11 compatibility

I have updated Drupal to 11.0, and now I have this with PHPSTAN :

  Line   src/Plugin/Validation/Constraint/RequiredArrayValuesConstraint.php                                                                                                              
  45     Method Drupal\ui_patterns\Plugin\Validation\Constraint\RequiredArrayValuesConstraint::getDefaultOption() has no return type specified.                                          
  45     Return type mixed of method Drupal\ui_patterns\Plugin\Validation\Constraint\RequiredArrayValuesConstraint::getDefaultOption() is not covariant with return type string|null of  
         method Symfony\Component\Validator\Constraint::getDefaultOption().                                                                                                              
  52     Return type mixed of method Drupal\ui_patterns\Plugin\Validation\Constraint\RequiredArrayValuesConstraint::getRequiredOptions() is not covariant with return type array of      
         method Symfony\Component\Validator\Constraint::getRequiredOptions().   

Is it normal new phpstan errors are popping when updating dependencies? If I fix them, do that mean I will introduce phpstan errors in Drupal 10.3 (the gitlab CI is till on 10.3) ?