API - Categories for users

I am working on some external automation on Dolibarr 16.0.3 using the REST API. I am able to use “Get the list of objects in a category” endpoint (“/categories/{id}/objects”) for customers, contacts, but it does not work for users, it just returns an empty list when the type (in the query parameter) is “user”. In the UI everything is working correctly: I can add tags to users and I can see the users assigned to each tag. I checked “api_categories.class.php” and although I have no experience with php, I noticed that the user type is missing from the functions: getListForObject and getObjects. Am I doing something wrong? Do you have any tips on how should I solve this?