Thank you for another report!
We should fix those pushers not acting physically and then figure out if additional actions are required for collisions. Fun fact, spike used to get stuck in walls and that was super annoying. We changed collision mode to be more precise and that fixed it. I hope we won't have to do it for all Zooids though.
Re DD22: Please, feel free to continue testing! You have provided valuable reports, we highly appreciate that. DD22 was intended for a gamedev community to test and provide feedback on.