Its not particularly unusual. Wet areas can be swapped if the plumbing is suitable.
I was successful in changing my 2BRM 1BTH apartment into a 2BRM 2BTH apartment as the laundry was changed to a bathroom, and the washer dryer from the laundry were placed in the kitchen as per European configurations.
If there is enough space and a window then an extra bedroom could successfully be created.
People often utilise spaces differently nowadays.