Hello, and welcome to OSM.

Since you present yourself as GIS professionals, you may be interested to know that, since OSM is a geographical database of the world, we do *not* repeat some information on every object of our database.

In particular the post code and the town name.

Every object within this area is automatically recognised as having post code 2275: https://www.openstreetmap.org/relation/3363890

Every object within this area is automatically recognised as being inside Lille municipality: https://www.openstreetmap.org/relation/1282972

This is the reason why we always abstain from repeating this data on every object.  Experience shows that it inevitably leads to corrupted data.

Also, I observe some data integrity errors in this area now.  Just one example: Ursulinenstraat 13 now returns several different buildings (https://www.openstreetmap.org/way/377877874 + https://www.openstreetmap.org/way/721633495 + https://www.openstreetmap.org/way/1046688260) + many examples of unique keys which you have duplicated: some schools were properly mapped as polygons and now I see the same school information repeated on the main school building.

Thanks in advance.