On the paper it's a little confusing on reading the article of Reflexcity and RTBF also making some shortcuts.

Place des 3 septembre - 3 septemberplein is here : 

https://www.openstreetmap.org/way/781403083

Both are correctly mapped as signed on the ground : 

https://www.mapillary.com/app/?pKey=879298783900858
https://www.mapillary.com/app/?pKey=1782591515525931
https://www.mapillary.com/app/?pKey=310902308385528
