Update: the cycle track has only been done until Harensesteenweg, not until Schaarbeeklei, and it seems that it's intended to stay this way. Apologies, I didn't see it when making the picture/note by the canal. So https://www.openstreetmap.org/way/1292618807 and https://www.openstreetmap.org/way/1292618806 are correct, but  https://www.openstreetmap.org/way/805284613 is not. I don't want to cut it myself, as it seems to have some earlier versions that I don't fully understand.