I found that enabling CCD within a blueprint didn’t work. It helped slightly but not much. HOWEVER, enabling CCD on the mesh’s actual physics asset. THIS FIXED IT COMPLETELY.
For me, this let me drop a small object from 250 meters up onto landscape terrain without ever falling through. Before I had CCD from within a blueprint, and it didn’t even fix it for 20 meters.
Enable it on the actual physics asset and it seems to work.