Animated Passive Objects Moving Through Each Other

Attached is a simple paddle wheel with some spheres on a ramp. The paddle wheel is animated and passive, and is supposed to control the active spheres rolling down the ramp.


Why are the spheres passing through the paddle wheel?

Attachments

Test.blend (524 KB)

The objects all need to be part of the same RigidBodyWorld group

Attachments

Test (3).blend (346 KB)