OIDC Login removes super admin role from user for no reason

[JensUweB]

Hello & thanks for your work so far.
I'm currently testing your plugin with our Strapi app and I run into the following problem:

1. Initialize new Strapi instance with a clean database and create your Super Admin user - let's say with email user1@domain.com
2. Go to /admin & login as user1@domain.com with your choosen password. Everything works normally.
3. Logout & Go to /strapi-plugin-sso/oidc & login with user2@domain.com.
4. Logout, go to /admin & login as user1@domain.com again. Now your user1 lost its Super Admin role despite never been managed via the sso plugin at all.

I initialy didn't choose any role at the SSO page in the admin panel because I want to set roles for the users individually. When I choose lets say author as default role even the Super Admin user1 gets assigned the author role and loses its Super Admin role.

In my case Admins, Editors & Authors will use the same OAuth Provider (Nextcloud in my case with OIDC Plugin).

Strapi Version: 4.24.5
Node Version: 18.20.3

Plugin config:

  'strapi-plugin-sso': {
    enabled: true,
    config: {
      // Either sets token to session storage if false or local storage if true
      REMEMBER_ME: true,

      // OpenID Connect
      OIDC_REDIRECT_URI: env('API_URL') + '/strapi-plugin-sso/oidc/callback', // URI after successful login
      OIDC_CLIENT_ID: env('OIDC_CLIENT_ID'),     
      OIDC_CLIENT_SECRET: env('OIDC_CLIENT_SECRET'),
      
      OIDC_SCOPES: 'openid profile email', // https://oauth.net/2/scope/
      // API Endpoints required for OIDC
      OIDC_AUTHORIZATION_ENDPOINT: 'https://domain.cloud/index.php/apps/oidc/authorize', 
      OIDC_TOKEN_ENDPOINT: 'https://domain.cloud/index.php/apps/oidc/token',
      OIDC_USER_INFO_ENDPOINT: 'https://domain.cloud/index.php/apps/oidc/userinfo',
      OIDC_USER_INFO_ENDPOINT_WITH_AUTH_HEADER: true,
      OIDC_GRANT_TYPE: 'authorization_code', // https://oauth.net/2/grant-types/
      // customizable username arguments
      OIDC_FAMILY_NAME_FIELD: 'name',
      OIDC_GIVEN_NAME_FIELD: 'given_name', // Nextcloud doesn't have distinct first-/last name fields
    }
  }

With this behavior the plugin is basically useless for us, because just granting Super Admin role as default for everyone is obviously no option.