Yes, that is how our '66 Newport Town Sedan came from the factory. If you look at the complete "circle" the belts make, when joined, it makes for a more gradual and spread-out "force application" to the person's body. Rather than the more U-shaped shape if they were done otherwise. It also spreads any related forces to the driveshaft tunnel, rather than centering on just the seat belt bolts themselves.
In some respects, this might be a "minor deal", but it also indicated to me that Chrysler was doing it in a manner better than what Ford or GM was doing on their bench seat cars. Spreading any forces over a larger area of the car.
CBODY67