I don't know. Organic Maps add it automatically

ok, przepraszam

nie, ma tez building:part osm.org/way/1193619905
osm.org/way/1193619904

https://imgtr.ee/images/2023/08/01/8f9aed88c3afd177f4fdf95fed9d24ac.jpeg

Do you see two walls between buildings? This is my defining of 2 buildings with common wall. The same is with 3rd building in this row.
And that is the Ground Truth.
good luck with reporting

in previous time you reverted my changes here where they was just fine with right levels
so don't start edits war

budynek wygląda na gotowy