On disabling the password policy module, it doesn't remove the module based field added to the user entity. Ideally when the module is disabled it should removed the fields i.e.
'field_last_password_reset', 'field_password_expiration', 'field_pending_expire_sent'
If the module is enabled, disable the module and then try to do clear the cache Drupal version : 10.4.7
Remove the fields mentioned in the description using the uninstall hook added to the .install file