GraphQL results are missing some users

I am using a self-hosted 13.3.5-ee.

If I execute this GraphQL query using the /-/graphql-explorer endpoint on my GitLab deployment:

query {                                                                                                                                                                                       
  users {                                                                                                                                                                                     
    nodes {                                                                                                                                                                                   
      id                                                                                                                                                                                      
      name                                                                                                                                                                                    
      username                                                                                                                                                                                
    }                                                                                                                                                                                         
  }
}

then 91 users are returned. This is clearly not all users on the deployment, though. There are users I know exist but which are not included in the result. This includes users which are referenced as the assignees of issues I can retrieve from the graphql interface. It also includes users on the team I work with who I know have accounts. I can also query for those missing users individually using this GraphQL query:

query {
  user(username: "someusername") {
    id
  }
}

and receive a result which seems to correctly describe the user.

Why are some users omitted from the results for this query? I know that large result sets require dealing with pagination but the default page size is supposed to be 100 and I am receiving fewer results than this. Additionally, if I request pageinfo and ask for the users after the resulting endCursor I receive no items.

How do submit a query that gets me all users (or at least lets me page through all users)?