Around these parts a bedroom for septic isn’t a bedroom of it has no closets or has a five foot opening.
Many years ago I bought and remodeled the house next door after it went into foreclosure. The first floor den was considered a bedroom. The closet was a joke. But to get certified the septic guy cut a five foot opening to the living room. And then closed it up after inspection.
Sometimes regulations make no sense.
OTOH there are many good regulations regarding safety.