There were several RAF bomber losses near Kortrijk/Courtrai in the night of 20/21 July 1944 with several evaders, however more to the SW of Belgium (West-Flanders).
There was a B-24 (42-100365) crash near Harveng, not too far from Mons-Binche. This one had four evaders. Date of 12 July 1944 on the other hand too early to make a match.
See
https://www.458bg.com/crewquirk.htm
Regards,
Leendert