OK, we refined the location of the stops, one is easy to see on aerial imagery, and both can be seen on this picture taken in 2019, this is the last one we have.
https://www.mapillary.com/app/?pKey=1332856273764616

The itinerary has been changed, this should be correct now:
https://www.openstreetmap.org/relation/3911#map=19/50.90467/4.77086 (from Leuven)
https://www.openstreetmap.org/relation/1606056#map=19/50.90451/4.77028 (to Leuven)