I travelled in March 2020 in Golden Temple mail (12903) in coach no. 962570 (ICF coach)
The old design Coach near one Door, had almost one bay ( one LB, one MB, one UB) extra made for Railway Employees, which was occupied probably by Waitlised passengrs, plus an extra seat to sit.
If old Designs can muster space to sleep for Rail employees/extra passengers, I believe this feature must also be introduced in newely made LHB coaches.