I did find a work around for you to get the correct status. Instead of using get_joborder, use the get_joborders call with the following filter "id;isexactly;12345" where 12345 is the job order ID. This call does display the custom status name.
(We are looking into correcting the issue on get_joborder. We have to be cautious when
changing something like this because other API users may be relying on
this behavior.)
Aaron