both part of a splitted way should inherit the relations the unsplitted way was in
|Reported by:||openstreetmap@…||Owned by:||framm|
when splittin a way in several parts only one of them keeps the relations the old way had. all other new way just inherit their tags.
this happens often, when one tries to add a bridge to an existing highway as highways get a route relation and splitting destroys this route.