Raphael, thanks for the very helpful survey!!
I passed myself as well this morning and I found the school. It added it here -> https://www.openstreetmap.org/node/11815130373
in the same building, on level=2 a mess still takes place -> https://www.mapillary.com/app/?pKey=2575000102704901
there's still one issue with the "address" of the building ... I will ask for 2nd opinion