The 4-digit roads are in HB now.
I realized that WebGIS is usually (always?) confirmed by the road list which has documents with pics of the major junctions from March 2023.
However, road routing on WebGIS is sometimes where no road is as one can see on satellite view. For instance R2246.
OSM does sometimes indicate wrong numbers, have incorrect routings - mainly through towns - or is simply extending routes incorrectly. It seems that OSM is not a reliable source.
The old alignment of A3 Stip-Kocani is still indicated as A3 on March 2023 data albeit a parallel A3 expressway was opened in December 2022. The expressway is indicated as "(avtopat)".
We don't have the old alignment in HB. I will add a R road once I will have spot it in official data.