parse-server: Query for Parse.User is empty when calling 2nd time

Environment Setup

Parse Server 2.2.2 Using Parse JS SDK

Steps to reproduce

I’m setting an ACL for every user that is saved in an afterSave Hook:

Parse.Cloud.afterSave('_User', function(request, response) {
  // Use the masterkey
  Parse.Cloud.useMasterKey();
  // Get the user
  var user = request.object;
  // Create an ACL
  var userACL = new Parse.ACL();
  userACL.setPublicReadAccess(false);
  userACL.setReadAccess(user, true);
  userACL.setWriteAccess(user, true);
  userACL.setRoleWriteAccess("admin", true);
  userACL.setRoleReadAccess("admin", true);
  // Set the ACL to the user
  user.setACL(userACL);
  // Save the user
  user.save()...

This should now allow only the user itself or and admin user to read/write the user object. When I now query for ALL users as and admin like this:

    let query = new Parse.Query(Parse.User);
    query.ascending('username');
    query.find().then(users => {
      this.users = users;
      console.log(this.users);
    }, error => {
      console.log('Error: ' + error.code + ' ' + error.message);
    });

I get a list of all users. But when I run the same query a second time, it is empty.