OSM indicates the eastern bypass being
R47. OSM was
updated back in November 2024Road 47 is now signed both through and east of Grästorp. Heavy vehicles are no longer allowed to drive through Grästorp.
trafikverket.se and GM do still indicate O2561.
May 2023 GSV shows construction at south end. So, it's possible that the road was upgraded to R47 afterwards. Or R47.1 what would not call for adding the route to HB.
To be revisited, check trafikverket.se or GSV for signage.