I found another very, very serious bug. The provider does not compare mail when creating a record. Here’s what you can get:
Created 2 users with one mail. One user is created by the provider, the second - by standard registration.
This behavior is critical and can break the entire application. In the settings, I indicated that one user has one mail.
I would pass this discussion on to the developers. This is indeed a serious problem. in our applications, we often use mail to interact with users.