I'm having a strange behaviour while trying to use hook_node_access in Drupal 8 (Lightning to be more precise) and I can't figure out why is doing this. Let's suppose that I want to always allow people to edit a certain content type (I know I can setup role permissions to achieve this, but I'm just trying to understand why it's not working):

function mymodule_node_access($node, $op, $account) {
  if($type == 'service' && $op == 'update') {
      return AccessResult::allowed();
  }
}

I always get "access denied" while trying to edit a "service" node.

This is what I've tried to do in order to debug it:

• in reports > status reports there are no node access permissions in use;
• the current user does not have "bypass content access control" permission;
• hook_module_implements_alter doesn't return any other module using hook_node_access.

Is there anything I'm missing?

Thanks!