Authenticated users missing from users_roles table
It is not an "issue" - but the authenticated user role is not registered in the users_role table.  For this type of user, the status is determined by the field statusin the users table.

AFAIK, every user registered in the users table is considered having the "authenticated user" role, so there is no need to explicitly register this role in the  users_role table. Instead, users having this should have their status set to "blocked" when you want to "strip" them of any grants.