Route-only strange behave

Hi the new Cycle route-only planning is great. It is exactly what is it missing in most navigators including OsmAnd+ which is use a lot

Yet it behaves strangely in some situation

If I create a route from City of Edinburgh to Aberdeen City using the “Routes” feature it goes through various National Routes to Inverness and then east and south bound to Aberdeen for a total of 503km

If you choose Paved instead, it goes straight to Aberdeen through Eurovelo 12 (I think it is National Route 1) in just 228km

Thanks

Nick from Italy